Major Minerals and Calcium Functions
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Questions and Answers

What are the four major functions of calcium in the human body?

Structural component of bones and teeth, blood clotting, transmission of nerve impulses, and muscle contraction

What is the recommended daily intake of calcium for adults, excluding pregnant or breastfeeding women?

1000-1200 mg

What are some major dietary sources of calcium?

Milk and milk products, canned fish, tofu made with calcium sulfate, leafy vegetables, calcium-fortified foods such as orange juice

What are the potential risks of inadequate calcium intake?

<p>Increased risk of osteoporosis, may increase risk of hypertension</p> Signup and view all the answers

What is the upper level intake of calcium that may cause adverse effects?

<p>2.0-2.5 g/day</p> Signup and view all the answers

What can be done to improve calcium intake without relying on dietary supplements?

<p>Increase consumption of calcium-rich foods, such as milk, fish, and fortified foods, and consider consulting a registered dietitian or healthcare professional for personalized nutrition advice</p> Signup and view all the answers

What is the primary function of sodium in the human body?

<p>Maintenance of proper fluid balance, transmission of nerve impulses, and muscle contraction</p> Signup and view all the answers

What is the recommended daily intake of potassium for adults?

<p>4700 mg</p> Signup and view all the answers

What is the role of magnesium in the human body?

<p>Bone strengthening, serves as a cofactor for certain enzymes, and maintains normal heart and nerve functioning</p> Signup and view all the answers

What is the structural role of phosphorus in the human body?

<p>Component of bones and teeth, and maintenance of acid-base balance</p> Signup and view all the answers

What is the primary function of chloride in the human body?

<p>Maintenance of proper fluid balance and production of stomach acid</p> Signup and view all the answers

What is the role of sulfur in the human body?

<p>Component of organic compounds such as certain amino acids and vitamins</p> Signup and view all the answers

What is the primary function of calcium in the human body?

<p>Formation of bones and teeth, and involved in muscle contraction, blood clot formation, nerve impulse transmission, and cell metabolism</p> Signup and view all the answers

What is the process of bone remodeling?

<p>Breaking down bone where there is little stress and building bone where there is more stress</p> Signup and view all the answers

What is the role of the thyroid and parathyroid glands in the human body?

<p>Help regulate blood calcium levels</p> Signup and view all the answers

What is the primary function of parathyroid hormone (PTH) in response to falling blood calcium levels?

<p>PTH signals osteoclasts to break down bone tissue, releasing calcium into the bloodstream.</p> Signup and view all the answers

What is the recommended daily intake of calcium for adults?

<p>Not specified (varies by age and sex)</p> Signup and view all the answers

What hormone is secreted by the thyroid gland to counteract high blood calcium levels?

<p>Calcitonin</p> Signup and view all the answers

What is the primary source of calcium in American diets?

<p>Fluid milk, yogurt, and cheese</p> Signup and view all the answers

Why is the calcium content of cottage cheese lower than that of milk?

<p>Cottage cheese loses up to half of its calcium content during processing.</p> Signup and view all the answers

What are the two naturally occurring substances that interfere with calcium absorption from plant-based foods?

<p>Phytic acid and oxalic acid</p> Signup and view all the answers

What is the bioavailability of calcium from plant-based foods compared to milk and milk products?

<p>Lower</p> Signup and view all the answers

What is a potential health risk associated with long-term ingestion of calcium from antacids?

<p>Kidney stones</p> Signup and view all the answers

What is a symptom of toxicity from taking antacids containing calcium carbonate and magnesium?

<p>Bone pain</p> Signup and view all the answers

What are some good plant sources of calcium?

<p>Broccoli, leafy greens (kale, collard, turnip, bok choy, mustard greens)</p> Signup and view all the answers

What is the amount of elemental calcium provided by an antacid pill containing 750 mg of calcium carbonate?

<p>300 mg</p> Signup and view all the answers

Why does the oxalic acid in spinach reduce the availability of the plant's calcium content?

<p>Oxalic acid in spinach reduces the availability of the plant's calcium content because it limits bioavailability.</p> Signup and view all the answers

What percentage of calcium in milk is bioavailable?

<p>About 30%</p> Signup and view all the answers

What is the purpose of adding vitamin D to calcium supplements?

<p>To enhance calcium absorption.</p> Signup and view all the answers

Why do vegetarians and lactose-intolerant individuals have a higher risk of calcium deficiency?

<p>Because they often avoid consuming milk and milk products, the most reliable dietary sources of calcium.</p> Signup and view all the answers

What is the maximum amount of calcium that can be absorbed by the body during stages of life when calcium needs are high?

<p>About 60%</p> Signup and view all the answers

Why do older adults, especially women, have lower calcium absorption?

<p>Due to age-related decline in calcium absorption.</p> Signup and view all the answers

What is the benefit of taking calcium supplements with meals?

<p>To improve calcium absorption.</p> Signup and view all the answers

What is the risk associated with taking high-dose calcium supplements (more than 1000 mg/day)?

<p>Increased risk of cardiovascular disease.</p> Signup and view all the answers

What is the purpose of the 'seal of approval' on dietary supplement labels?

<p>It is not a guarantee of product safety or effectiveness.</p> Signup and view all the answers

Why is calcium considered a 'nutrient of public health concern'?

<p>Because many people, especially women, do not consume enough calcium to meet their daily needs.</p> Signup and view all the answers

Why do women have a higher risk of osteoporosis after menopause?

<p>Because their ovaries no longer produce estrogen, leading to an imbalance between bone loss and bone replacement.</p> Signup and view all the answers

What is a simple way to monitor bone mass?

<p>By tracking height; losing an inch or more of adult height may indicate osteoporosis.</p> Signup and view all the answers

Who should consider getting tested for bone mineral density?

<p>Individuals with a family history of osteoporosis, men with low testosterone, and postmenopausal women.</p> Signup and view all the answers

What lifestyle changes can reduce the risk of osteoporosis?

<p>Proper diet, regular exercise, and adequate calcium and vitamin D intake.</p> Signup and view all the answers

Why is it essential to choose foods with high calcium content?

<p>To provide adequate calcium for building and maintaining strong bones.</p> Signup and view all the answers

What type of physical activities can improve bone mass?

<p>Weight-bearing activities, such as running, jumping, and weightlifting.</p> Signup and view all the answers

Why is estrogen important for bone health in women?

<p>Estrogen helps regulate bone loss and replacement, maintaining strong bones.</p> Signup and view all the answers

What are some risk factors for osteoporosis?

<p>Age, gender, family history, low estrogen or testosterone, and small body frame.</p> Signup and view all the answers

Why is regular exercise important for bone health?

<p>Exercise helps build strong bones and improve balance, reducing the risk of falls and osteoporosis.</p> Signup and view all the answers

What can be done to improve calcium intake without relying on supplements?

<p>Reading food labels, choosing calcium-rich foods, and consuming fortified products.</p> Signup and view all the answers

What is the significance of maximizing bone mass, especially during youth?

<p>To reduce the risk of osteoporosis</p> Signup and view all the answers

What is the primary source of sodium in American diets?

<p>Salt</p> Signup and view all the answers

What is the role of sodium in nerve function?

<p>Transmission of impulses</p> Signup and view all the answers

What is the recommended daily intake of sodium for adults under 51 years old?

<p>1500 mg/day</p> Signup and view all the answers

What is a potential health risk associated with acute excessive salt ingestion?

<p>Hypernatremia</p> Signup and view all the answers

Why is it essential to taste crystalline 'sugar' before adding it to a formula or recipe?

<p>To avoid accidental poisoning</p> Signup and view all the answers

What type of activities can result in extensive sodium loss through sweat?

<p>Marathon running or working in extremely hot conditions</p> Signup and view all the answers

What are some common food additives that contain sodium?

<p>Sodium nitrate, sodium citrate, and monosodium glutamate (MSG)</p> Signup and view all the answers

What is the sodium content of a teaspoon of table salt?

<p>2325 mg</p> Signup and view all the answers

What is the minimum daily sodium requirement for humans?

<p>180 mg</p> Signup and view all the answers

What is the recommended daily intake of calcium for women over 50 years of age and adults over 70 years of age?

<p>1200 mg/day</p> Signup and view all the answers

What is hypercalcemia, and what are its signs and symptoms?

<p>Hypercalcemia is a condition characterized by a higher-than-normal concentration of calcium in the blood. Its signs and symptoms include bone pain, muscle weakness, and fatigue.</p> Signup and view all the answers

What is osteoporosis, and how many Americans have it?

<p>Osteoporosis is a chronic disease characterized by loss of bone mass and reduced bone structure. More than 10 million Americans have osteoporosis.</p> Signup and view all the answers

What is the likelihood of osteoporosis-related fractures in older adults?

<p>Half of women and up to one-fourth of men who are over 50 years of age will have an osteoporosis-related fracture at some point.</p> Signup and view all the answers

What is the mortality rate for older Americans who experience a broken hip due to osteoporosis?

<p>One in five older Americans who experiences a broken hip dies of complications related to the fracture within 1 year of the injury.</p> Signup and view all the answers

What are some risk factors for osteoporosis that cannot be modified?

<p>Being a woman, growing older, having white or Asian ancestry, having a family history of osteoporosis, and having a small, thin-boned body frame.</p> Signup and view all the answers

At what age do people typically reach their peak bone mass?

<p>Around 30 years of age</p> Signup and view all the answers

What happens to bone tissue in mid-adulthood?

<p>Loss of bone tissue begins</p> Signup and view all the answers

What is the significance of the Upper Level (UL) for calcium?

<p>It is the maximum daily intake of calcium that is unlikely to cause adverse health effects.</p> Signup and view all the answers

What is the difference between osteoporosis and osteoporosis-related fractures?

<p>Osteoporosis is a chronic disease characterized by loss of bone mass and reduced bone structure, while osteoporosis-related fractures are breaks in bones that occur due to osteoporosis.</p> Signup and view all the answers

What is the percentage of adult Americans that have hypertension?

<p>Approximately one-third</p> Signup and view all the answers

What is the average amount of sodium consumed by adult Americans per day?

<p>3531 mg</p> Signup and view all the answers

What is the Chronic Disease Risk Reduction Intake (CDRR) for sodium?

<p>Below 2300 mg/day</p> Signup and view all the answers

What is the primary way to detect hypertension?

<p>Regular blood pressure screenings</p> Signup and view all the answers

What is the healthy blood pressure reading for adults?

<p>Less than 120/80 mm Hg</p> Signup and view all the answers

What is the risk of sodium depletion in endurance athletes?

<p>Dehydration and sodium depletion</p> Signup and view all the answers

What is the recommended way to restore the body's sodium content?

<p>Drinking fluids and eating salty foods or adding salt to foods</p> Signup and view all the answers

What can lead to sodium depletion in infants?

<p>Diarrhea or vomiting</p> Signup and view all the answers

Why are salt tablets not recommended for sodium replacement?

<p>No specific reason mentioned in the text</p> Signup and view all the answers

What are the two major risk factors for hypertension that can be modified through lifestyle changes?

<p>Obesity and physical inactivity</p> Signup and view all the answers

What is the daily sodium intake recommended to reduce the risk of hypertension?

<p>2300 mg</p> Signup and view all the answers

What is the term used to describe individuals who are more likely to develop hypertension as a result of consuming a high-sodium diet?

<p>Sodium sensitive</p> Signup and view all the answers

What is the blood pressure category defined as systolic pressure of 120-129 mm Hg and diastolic pressure of less than 80 mm Hg?

<p>Elevated</p> Signup and view all the answers

What is the recommended daily alcohol intake to reduce the risk of hypertension?

<p>Two or fewer drinks/day (men) and one drink/day (women and older adults)</p> Signup and view all the answers

What is the term used to describe the buildup of plaque in arteries that can interfere with normal blood vessel function and lead to hypertension?

<p>Atherosclerosis</p> Signup and view all the answers

What is the age-related change that can contribute to increased blood pressure?

<p>Stiffening of arteries</p> Signup and view all the answers

What is the condition characterized by excessive amounts of body fat that is a major risk factor for hypertension?

<p>Obesity</p> Signup and view all the answers

What is the category of blood pressure defined as systolic pressure of 130-139 mm Hg or diastolic pressure of 80-89 mm Hg?

<p>Hypertension Stage 1</p> Signup and view all the answers

What is the blood pressure category defined as systolic pressure greater than 180 mm Hg and/or diastolic pressure greater than 120 mm Hg?

<p>Hypertensive Crisis</p> Signup and view all the answers

What is the main difference between the role of sodium and potassium in maintaining blood pressure?

<p>Sodium is associated with higher blood pressure values, while potassium is associated with lower blood pressure values.</p> Signup and view all the answers

What are the primary sources of potassium in the American diet?

<p>Fresh fruits and vegetables, and fruit and vegetable juices</p> Signup and view all the answers

What lifestyle changes can Justin Steinbruegge attribute to no longer needing blood pressure medication?

<p>A healthy combination of diet and exercise, avoiding processed foods, eating mainly fresh meats, cheeses, nuts, fruits, and vegetables, and drinking only water.</p> Signup and view all the answers

What is the purpose of the DASH diet in reducing the risk of CVD?

<p>To lower blood pressure and reduce the risk of CVD by following a diet low in sodium, total fat, and saturated fat, and high in fruits, vegetables, whole grains, and fat-free or low-fat dairy products.</p> Signup and view all the answers

What is the AI for potassium for men, and for women?

<p>3400 mg per day for men, and 2600 mg per day for women</p> Signup and view all the answers

What is the role of potassium in counteracting high sodium intakes?

<p>Consuming foods naturally rich in potassium and low in sodium can counteract high sodium intakes</p> Signup and view all the answers

What are some empty calories that Justin could replace with fresh fruit and unsalted nuts in his daily meals and snacks?

<p>Salty snacks and pizzas</p> Signup and view all the answers

What is the risk of taking potassium supplements, especially for individuals with kidney diseases?

<p>The risk of toxicity, as the body cannot eliminate excess potassium, which can cause the heart to stop beating</p> Signup and view all the answers

What are the recommended daily limits for alcohol consumption to reduce the risk of hypertension?

<p>No more than two drinks/day for men and one drink/day for women and older adults.</p> Signup and view all the answers

What are some practical steps to reduce the risk of hypertension, according to Table 9.12?

<p>Follow dietary recommendations of MyPlate, reduce salty food consumption, maintain a healthy body weight, and increase physical activity.</p> Signup and view all the answers

What percentage of magnesium is absorbed by the body from the diet?

<p>About 30 to 40%</p> Signup and view all the answers

What was Justin's initial difficulty in managing his high blood pressure?

<p>Controlling his sodium intake, which led to his blood pressure being on a 'never-ending roller coaster ride'</p> Signup and view all the answers

What is the role of magnesium in the body, beyond muscle and nerve function?

<p>Regulating blood pressure and blood glucose levels, and maintaining strong bones and a healthy immune system</p> Signup and view all the answers

What is the recommended eating plan to reduce the risk of CVD and hypertension?

<p>The DASH diet, which is low in sodium, total fat, and saturated fat, and high in fruits, vegetables, whole grains, and fat-free or low-fat dairy products.</p> Signup and view all the answers

What is the significance of including magnesium-rich foods in the diet?

<p>It can enhance bone health and reduce the risk of heart disease, stroke, and diabetes</p> Signup and view all the answers

What is a potential health risk associated with low potassium intakes?

<p>Potassium deficiency, which can lead to symptoms such as loss of appetite, muscle cramps, confusion, and constipation</p> Signup and view all the answers

What was Justin's turning point in improving his health?

<p>When he enrolled in a police academy and started an exercise program four months prior to entering the academy.</p> Signup and view all the answers

What is the significance of maintaining a healthy body weight in reducing the risk of hypertension?

<p>Attaining and maintaining a healthy body weight can reduce the risk of hypertension.</p> Signup and view all the answers

What type of food is naturally rich in potassium, according to Figure 9.17?

<p>Acorn squash</p> Signup and view all the answers

What is the advantage of following the DASH diet?

<p>It can lower blood pressure, and provide adequate amounts of potassium</p> Signup and view all the answers

What physiological symptoms may occur due to chloride deficiency?

<p>Fatigue and loss of appetite</p> Signup and view all the answers

What is the upper limit of chloride intake per day to avoid adverse effects?

<p>3600 mg/day</p> Signup and view all the answers

What type of foods are rich in sulfur and can help prevent deficiency?

<p>Protein-rich foods</p> Signup and view all the answers

Why is sulfur toxicity unlikely from dietary sources?

<p>Because sulfur is part of many organic compounds and is not typically present in excessive amounts in food and beverages</p> Signup and view all the answers

What are the consequences of mild magnesium deficiency in humans?

<p>Tiredness, weakness, loss of appetite, nausea, and vomiting.</p> Signup and view all the answers

What is the consequence of consuming excessive sodium chloride?

<p>Hypertension</p> Signup and view all the answers

Why are cases of sulfur deficiency rare in the United States?

<p>Because most people consume sufficient protein-rich foods that provide adequate sulfur</p> Signup and view all the answers

Why are older adults at risk of magnesium deficiency?

<p>Their bodies absorb less of the mineral and urinary losses increase with advancing age.</p> Signup and view all the answers

What is the upper level intake of magnesium that may cause adverse effects?

<p>350 mg/day</p> Signup and view all the answers

Why do people with poorly controlled diabetes have a high risk of magnesium deficiency?

<p>Due to increased urinary excretion of magnesium.</p> Signup and view all the answers

What is the primary function of chloride in the human body?

<p>Maintaining proper fluid and acid-base balance, transmission of nerve impulses, and production of hydrochloric acid (HCl) in the stomach.</p> Signup and view all the answers

What is the recommended daily intake of chloride?

<p>2300 mg (Adequate Intake, AI)</p> Signup and view all the answers

Why are people with kidney failure at risk of magnesium toxicity?

<p>Because their kidneys do not excrete magnesium as effectively.</p> Signup and view all the answers

What are some rich food sources of magnesium?

<p>Spinach, green leafy vegetables, whole grains, beans, nuts, seeds, and chocolate.</p> Signup and view all the answers

Why is tap water a source of magnesium?

<p>Because it can contain magnesium and other mineral nutrients.</p> Signup and view all the answers

What is the significance of dietary magnesium supplements in meeting a person's magnesium needs?

<p>They can contribute to meeting magnesium needs, but the body does not absorb the form of magnesium (magnesium oxide) in multivitamin/mineral supplements very well.</p> Signup and view all the answers

What is the recommended daily intake of sodium for healthy people to reduce the risk of chronic disease, including hypertension?

<p>Below 2300 mg/day</p> Signup and view all the answers

What is the amount of sodium in one teaspoon of salt?

<p>About 2300 mg</p> Signup and view all the answers

What is the recommended daily intake of sodium for people with high-risk populations, particularly those with elevated blood pressure?

<p>1500 mg per day</p> Signup and view all the answers

Why should people check the ingredient list when buying seasonings?

<p>To avoid added salt</p> Signup and view all the answers

What can be used as an alternative to salt to enhance the taste of food?

<p>Garlic, citrus juice, and herbs and spices</p> Signup and view all the answers

Why is it important to have regular blood pressure checks as you grow older?

<p>Because the risk of hypertension increases with age</p> Signup and view all the answers

What was the concern regarding certain medications and COVID-19?

<p>That they increased the risk of developing COVID-19 and caused more severe infections</p> Signup and view all the answers

What was the outcome of the research on ACE inhibitors, ARBs, and COVID-19?

<p>No increased risk of developing COVID-19 or severe complications</p> Signup and view all the answers

Why is it important to read Nutrition Facts panels before purchasing packaged foods?

<p>To determine the sodium content of the items</p> Signup and view all the answers

What is an effective way to reduce sodium intake when eating out?

<p>Requesting no salt be added to your food during preparation</p> Signup and view all the answers

Study Notes

Major Minerals

  • The major minerals include calcium, sodium, potassium, magnesium, phosphorus, chloride, and sulfur.
  • These minerals have important functions in the body, such as maintaining proper fluid balance, transmission of nerve impulses, muscle contraction, and bone health.

Calcium (Ca)

  • Calcium is the most plentiful mineral element in the human body.
  • More than 99% of the body's calcium is stored in bones and teeth.
  • Calcium is essential for muscle contraction, blood clotting, nerve impulse transmission, and cell metabolism.
  • Calcium may also play a role in maintaining healthy blood pressure and immune function.
  • Good sources of calcium include milk and milk products, leafy greens, and fortified foods such as orange juice and cereals.

Bone Development and Maintenance

  • Bones are constantly being remodeled through a process involving bone resorption (tearing down) and bone formation (building up).
  • Osteoclasts break down bone tissue where it is not needed, while osteoblasts build bone tissue where it is needed.
  • This process allows bones to adapt to changes in physical stress and maintain strength.

Maintaining Normal Blood Calcium Levels

  • The body has a complex hormonal system to maintain calcium homeostasis.
  • The thyroid and parathyroid glands help regulate blood calcium levels.
  • When blood calcium levels are low, the parathyroid glands secrete parathyroid hormone (PTH), which stimulates the release of calcium from bones into the bloodstream.

Osteoporosis

  • Osteoporosis is a chronic disease characterized by loss of bone mass and reduced bone structure.
  • It leads to fragile bones that are susceptible to fractures, especially in older adults.
  • Risk factors for osteoporosis include smoking, lack of physical activity, low estrogen levels in women, and low testosterone levels in men.
  • Prevention and treatment of osteoporosis involve a combination of diet, exercise, and supplements to maintain strong bones.

Calcium Supplements

  • Many adults take calcium supplements to ensure adequate intake of the mineral.
  • However, taking high doses of calcium supplements (>1000 mg/day) may increase the risk of cardiovascular disease.
  • Calcium supplements should be taken with vitamin D to enhance absorption, and in divided doses (500 mg at a time) to improve absorption.

Hypertension and Osteoporosis

  • Hypertension and osteoporosis are both major public health concerns.
  • A diet that is high in sodium and low in potassium may contribute to hypertension.
  • Calcium and vitamin D supplements can help maintain strong bones and reduce the risk of osteoporosis.

Improving Intakes of Major Minerals

  • Eating a balanced diet that includes a variety of whole foods can help ensure adequate intake of major minerals.
  • Including foods rich in calcium, potassium, and magnesium, such as fruits, vegetables, whole grains, and lean proteins, can help maintain overall health.
  • Limiting sodium intake and increasing potassium intake can help reduce the risk of hypertension.
  • Regular physical activity and maintaining a healthy body weight can also help reduce the risk of osteoporosis.### Fat-Free Milk and Sodium Intake
  • Fat-free milk is a healthier option when making cooked oatmeal or pancake batter
  • Nonfat milk powder can be added to raw ground meat when preparing hamburgers, meatballs, or meatloaf to reduce sodium intake
  • Homemade smoothies can be made with plain low-fat yogurt, fresh or frozen fruit, and fat-reduced ice cream or sherbet to reduce sodium intake

Weight-Bearing Activities and Bone Mass

  • Performing weight-bearing activities increases bone mass due to contracting muscles keeping tension on bones
  • Examples of weight-bearing activities include low-impact aerobics, basketball, running or jogging, walking or hiking, jumping rope, dancing, stair climbing, strength training with weights, and tennis
  • Examples of non-weight-bearing activities include lying in bed, swimming, water aerobics, cycling, and traveling in reduced-gravity situations

Sodium and Health

  • Sodium is necessary for maintaining normal fluid balance, transmitting nerve impulses, and functioning of muscles
  • The human body can regulate its sodium concentration effectively, but sodium depletion can occur in certain situations such as excessive sweating or diarrhea
  • The recommended daily intake of sodium is 180 mg, but the Adequate Intake (AI) is 1500 mg/day
  • High sodium intake is associated with increased risk of chronic disease, including hypertension, heart disease, and stroke
  • The Upper Limit (UL) for sodium intake is 2300 mg/day

Hypertension

  • Hypertension is a condition characterized by persistently elevated blood pressure
  • Hypertension is a serious public health problem in the United States, affecting approximately one-third of adult Americans and one in nine children
  • High blood pressure generally does not cause symptoms until organs and blood vessels have been damaged
  • The best way to detect hypertension is to have regular blood pressure screenings
  • Healthy blood pressure readings are less than 120/80 mm Hg

Risk Factors for Hypertension

  • Advanced age
  • African-American ancestry
  • Obesity
  • Physical inactivity
  • Smoking cigarettes
  • Excess alcohol and sodium intake
  • Type 2 diabetes
  • Family history
  • Obesity and physical inactivity are modifiable risk factors

Reducing Sodium Intake

  • Read the Nutrition Facts panels before purchasing packaged foods
  • Prepare homemade meals and snacks as much as possible
  • Use herbs and spices that do not contain added salt while preparing foods
  • Taste food before salting it
  • Adjust to eating foods with less salt
  • Do not keep a salt shaker on the table
  • Request no salt be added to food when ordering in restaurants

The DASH Diet

  • The Dietary Approaches to Stop Hypertension (DASH) diet is low in sodium, total fat, and saturated fat, and high in fruits, vegetables, whole grains, and fat-free or low-fat dairy products
  • Research indicates that people can lower their blood pressure and reduce their risk of CVD by following the DASH diet, losing excess body fat, and increasing their physical activity level### Potassium (K)
  • Primary positively charged ion in intracellular fluid
  • Most of the body's potassium is found in cells
  • Plays a key role in maintaining proper fluid balance and transmitting nerve impulses
  • Associated with lower blood pressure values
  • Necessary for contracting muscles and maintaining normal kidney function
  • Potassium-rich diets, such as the DASH diet, may lower blood pressure
  • Food sources: fruits, vegetables, milk, whole grains, dried beans, and meats
  • Table 9.13 lists foods that are among the richest sources of potassium

Sources of Potassium

  • Fresh fruits and vegetables, and fruit and vegetable juices are good dietary sources
  • Milk, whole grains, dried beans, and meats are also major contributors
  • Table 9.13 lists foods that are among the richest sources of potassium
  • Figure 9.17 indicates food groups that are naturally good sources of potassium

Did You Know?

  • Salt substitutes often contain potassium chloride, or potassium chloride salt
  • People with severe kidney diseases may accumulate toxic levels of potassium in their blood
  • Fruits and vegetables are recommended sources of potassium instead of potassium chloride

Dietary Adequacy

  • AI for potassium for men: 3400 mg per day, for women: 2600 mg per day
  • Americans tend to consume less than the AI amount of potassium
  • The Dietary Guidelines include potassium as a “nutrient of public health concern”
  • People can raise their potassium intakes by following the DASH diet and/or increasing their consumption of foods rich in potassium

Risks of Potassium Deficiency

  • Symptoms: loss of appetite, muscle cramps, confusion, and constipation
  • Individuals suffering from excessive sweating, vomiting, diarrhea, or kidney diseases that increase potassium excretion are at risk for potassium depletion
  • The body is unable to conserve potassium as well as sodium; therefore, the risk of potassium deficiency is greater than that of sodium deficiency

Magnesium (Mg)

  • Participates in more than 300 chemical reactions in the body
  • Helps regulate normal muscle and nerve function, as well as blood pressure and blood glucose levels
  • Necessary for maintaining strong bones and a healthy immune system
  • Sources: plant foods such as spinach, green leafy vegetables, whole grains, beans, nuts, seeds, and chocolate
  • Table 9.14 lists some commonly eaten foods that supply magnesium

Dietary Adequacy

  • Adult RDAs for magnesium: 310-320 mg/day for women, 400-420 mg/day for men
  • Many people in the United States do not consume recommended amounts of magnesium
  • Cases of magnesium deficiency rarely occur among healthy members of the population
  • However, alcoholics, people with poorly controlled diabetes, or people who use certain medications (diuretics) that increase urinary excretion of magnesium are at high risk of magnesium deficiency

Risks of Magnesium Deficiency

  • Symptoms: tiredness, weakness, loss of appetite, nausea, and vomiting
  • Older adults are also at risk of magnesium deficiency because their bodies absorb less of the mineral and urinary losses increase with advancing age
  • Chronic magnesium deficiency may increase the risk of osteoporosis because the deficiency lowers the level of calcium in blood

Magnesium Toxicity

  • Rarely occurs from eating too much magnesium-rich food
  • Toxicity is more likely to occur from ingesting excessive magnesium from laxatives, antacids, or dietary supplements that contain the mineral
  • UL for magnesium: 350 mg/day
  • Symptoms: diarrhea, abnormal heartbeat rhythm, inability to relax muscles, personality changes, and seizures

Chloride (Cl–)

  • Primary negatively charged ion found in extracellular fluid
  • Essential for maintaining proper fluid and acid-base balance
  • Needed for the transmission of nerve impulses and production of hydrochloric acid (HCl) in the stomach
  • Sources: table salt (sodium chloride), seaweed, rye, tomatoes, celery, and olives
  • AI for chloride: 2300 mg

Risks of Chloride Deficiency

  • Deficiency unlikely because of high amounts of sodium chloride in the typical American diet
  • However, deficiencies may be seen in cases of extreme vomiting, diarrhea, and/or sweating, as well as with diuretic use
  • Symptoms: fatigue and loss of appetite

Sulfur (S)

  • Component of several organic compounds, including amino acids and vitamins
  • Essential for the activity of many enzymes and as part of antioxidant molecules
  • Sources: protein-rich foods, wines, and sulfites
  • Cases of sulfur deficiency are rare but can occur in people who have severe protein deficiency
  • Sulfur toxicity is unlikely from dietary sources

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Learn about the major minerals in the human body, including calcium, and their essential functions such as maintaining fluid balance, nerve impulses, muscle contraction, and bone health.

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