Weight Loss Maintenance Quiz

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Questions and Answers

What are common characteristics of individuals who successfully maintain long-term weight loss?

  • Regular voluntary exercise (correct)
  • High calorie intake
  • Frequent weight cycling
  • Increased appetite control (correct)

Which of the following factors contributes to the difficulty of maintaining weight loss over time?

  • Increased metabolic rate post-diet
  • Body's defense mechanisms for maintaining weight (correct)
  • Increased calorie intake requirements
  • Reduction in physical activity levels

Which statement best explains the concept of energy balance alternatives?

  • Maintaining energy balance requires eliminating all fat from the diet.
  • Weight gain can occur exclusively through diet changes.
  • Only healthy means of gaining weight should be considered.
  • Both healthy and unhealthy methods can be used to achieve energy balance. (correct)

Which of the following accurately describes fitness in relation to body composition?

<p>Individuals can be overweight but still possess high fitness levels. (B)</p> Signup and view all the answers

Why do most diets fail to sustain weight loss after initial success?

<p>The body decreases caloric expenditure and increases appetite post-diet. (C)</p> Signup and view all the answers

Which of the following diseases is associated with obesity?

<p>Hypertension (A)</p> Signup and view all the answers

What nutrient was fortified in bread to end the pellagra epidemic?

<p>Niacin (A)</p> Signup and view all the answers

Which of the following is NOT a typical consequence of obesity?

<p>Anemia (A)</p> Signup and view all the answers

Which accessory organ is primarily responsible for starch breakdown?

<p>Salivary glands (C)</p> Signup and view all the answers

Which of the following nutrients supplementation significantly reduced rickets prevalence?

<p>Vitamin D (B)</p> Signup and view all the answers

Which nerve is primarily responsible for linking most digestive organs?

<p>Vagus nerve (D)</p> Signup and view all the answers

What chronic condition can be avoided through the iodination of salt?

<p>Thyroid hormone deficiency (cretinism) (C)</p> Signup and view all the answers

Which of the following organs plays a direct role in the process of digestion?

<p>Esophagus (C)</p> Signup and view all the answers

What condition is characterized by pure protein deficiency?

<p>Kwashiorkor (B)</p> Signup and view all the answers

Which protein requirement is recommended for adults, according to nitrogen balance?

<p>0.8 g/kg (C)</p> Signup and view all the answers

What is the maximum amount of essential amino acids (EAA) needed to maximize protein synthesis?

<p>15 g (C)</p> Signup and view all the answers

Which combination is NOT considered a good source of plant-based protein?

<p>Fish and Tofu (B)</p> Signup and view all the answers

What does DIAAS stand for, and what is considered high quality?

<p>Digestible Indispensable Amino Acid Score; 100 or more (C)</p> Signup and view all the answers

What is the typical contribution of protein to the Acceptable Macronutrient Distribution Range (AMDR) for adults?

<p>10 to 35% (B)</p> Signup and view all the answers

During which periods may protein needs increase?

<p>During growth, pregnancy, and lactation (B)</p> Signup and view all the answers

What misconception about obesity is identified in relation to energy balance?

<p>Obesity is a state of energy imbalance. (A)</p> Signup and view all the answers

Which function is NOT performed by the intestinal barrier?

<p>Transporting hormones to the bloodstream (D)</p> Signup and view all the answers

Which phase of digestion begins with thought, smell, or taste of food?

<p>Cephalic Phase (B)</p> Signup and view all the answers

What substance is primarily responsible for initiating protein digestion in the stomach?

<p>Pepsin (B)</p> Signup and view all the answers

Which component is involved in neutralizing stomach acid during digestion?

<p>Bicarbonate (A)</p> Signup and view all the answers

During which phase of digestion does the movement of food in the stomach control its passage to the small intestine?

<p>Gastric Phase (A)</p> Signup and view all the answers

What is the primary role of bile in digestion?

<p>Emulsify fat (C)</p> Signup and view all the answers

Which hormone is released in response to an increase in acidity in the small intestine?

<p>Secretin (B)</p> Signup and view all the answers

What are the components of digestible energy derived from carbohydrates, proteins, and fats, respectively?

<p>4.0 kcal, 5.2 kcal, 9.0 kcal (D)</p> Signup and view all the answers

What is the primary determinant of Resting Energy Expenditure (REE)?

<p>Lean body mass (A)</p> Signup and view all the answers

Which of the following is NOT considered a risk factor associated with obesity?

<p>Enhanced respiratory function (A)</p> Signup and view all the answers

Which physiological aspect is primarily responsible for the capacity to deliver oxygen to working tissues?

<p>Oxygen carriage by red blood cells (B)</p> Signup and view all the answers

Which of the following diseases is least directly associated with obesity?

<p>Chronic fatigue syndrome (D)</p> Signup and view all the answers

How does the composition of body tissue change with regular exercise?

<p>Increases muscle mass, decreases fat mass (B)</p> Signup and view all the answers

What is the term for the condition characterized by a combination of multiple cardiovascular risk factors?

<p>Metabolic syndrome (B)</p> Signup and view all the answers

Which of the following does NOT reflect a secondary effect of fitness on health outcomes?

<p>Increased resting blood glucose levels (C)</p> Signup and view all the answers

What is the primary reason lean individuals with low fitness levels are at higher cardiovascular risk than obese individuals with high fitness?

<p>Cardiorespiratory fitness plays a critical role in cardiovascular health. (D)</p> Signup and view all the answers

What is a characteristic feature of extendin-4 compared to GLP-1?

<p>Extendin-4 is resistant to the enzyme that breaks down GLP-1. (C)</p> Signup and view all the answers

What role does the intestinal brake idea play in the effects of GLP-1?

<p>It triggers the release of signals for nutrient storage and satiety. (B)</p> Signup and view all the answers

What condition has been notably improved by GLP-1 treatments?

<p>Heart failure and overall cardiovascular deaths. (C)</p> Signup and view all the answers

Which dietary factor is identified as particularly detrimental in relation to triglyceride levels?

<p>Consumption of fructose. (C)</p> Signup and view all the answers

What population characteristics may indicate sensitivity to dietary carbohydrate effects?

<p>Obesity and insulin resistance. (B)</p> Signup and view all the answers

What recommendation is implied for the general public regarding dietary carbohydrates?

<p>To increase fiber and whole food intake. (A)</p> Signup and view all the answers

Which factor would NOT contribute to an altered triglyceride level, based on the discussion?

<p>Regular exercise habits. (D)</p> Signup and view all the answers

How does GLP-1 treatment influence weight loss?

<p>It signals for satiety and reduces overall food intake. (B)</p> Signup and view all the answers

Flashcards

Beriberi

A condition characterized by extreme weakness, usually resulting from a deficiency in thiamine (vitamin B1). It primarily affects the nerves and heart. Primarily associated with consuming polished rice (white rice) which lacks thiamine.

Lumen of the GI Tract

The lumen of the gastrointestinal tract is the internal space within the digestive system, from the mouth to the rectum. It's essentially the 'outside' of the body, as it's continuous with the external environment.

Vagus Nerve

The main nerve that connects the brain to various organs involved in digestion, including the stomach, small intestine, liver, gallbladder, pancreas, and others. It plays a crucial role in controlling digestive processes.

Nutrient Fortification

The process of enriching food with essential nutrients to prevent deficiencies. A classic example is the fortification of bread with niacin to prevent pellagra.

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Scurvy

A condition caused by a deficiency in vitamin C, leading to symptoms like fatigue, bleeding gums, and slow wound healing. Historically, it was common among sailors on long voyages.

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Pernicious Anemia

A serious condition caused by a deficiency in vitamin B12, leading to anemia, neurological problems, and even death. It's typically treated with regular injections of vitamin B12.

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Accessory Organs of Digestion

These are organs not directly part of the digestive tract but play a crucial role in digestion: Salivary glands, liver, pancreas, gallbladder.

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Cretinism

A condition resulting from a deficiency in iodine that leads to problems with thyroid hormone production, causing physical and mental development issues. This condition was once common in regions where iodine intake was inadequate.

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What does the digestive system act as?

The digestive system's first line of defense against harmful substances and pathogens, preventing unwanted substances from entering the bloodstream.

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What is digestion?

The process of breaking down food into smaller molecules that can be absorbed by the body.

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What is absorption in the digestive system?

The process where the digestive tract absorbs nutrients, water, and electrolytes, delivering them to the bloodstream.

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What is the hepatic portal circulation?

The specialized blood vessels connecting the digestive system to the liver, transporting absorbed nutrients.

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What is enterohepatic circulation?

Involves the liver secreting bile, which aids in fat digestion and is reabsorbed in the intestines. This cycle allows for efficient reuse of bile.

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What is the cephalic phase of digestion?

Triggered before food enters the stomach, this phase involves the brain stimulating gastric secretions, preparing the digestive system.

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What is the gastric phase of digestion?

The main phase of digestion in the stomach, involving the breakdown of food and the release of digestive enzymes and acids.

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What is the intestinal phase of digestion?

After food leaves the stomach, this phase slows down gastric secretion and motility, allowing for efficient processing in the small intestine.

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Enzymes

These proteins accelerate or slow down chemical reactions within the body, allowing metabolic processes to occur at a suitable pace.

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Transport proteins

These proteins act like delivery trucks, moving substances across cell membranes into or out of the cell.

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Antibodies

These proteins are part of the immune system, recognizing and neutralizing foreign invaders like bacteria or viruses.

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Contractile proteins

These proteins help muscles contract and relax, enabling movement.

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Hormones

These proteins act as chemical messengers, traveling through the bloodstream to regulate various bodily functions.

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Protein's role in fluid and acid balance

Proteins play a vital role in maintaining the right balance of fluids and acidity in your body.

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Protein deficiency

This is a condition caused by a lack of sufficient protein in the diet.

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Nitrogen balance

This measures the amount of protein your body needs based on the balance between protein intake and loss.

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Why is weight loss hard?

The human body actively tries to maintain its current weight, making weight loss difficult. When we reduce calorie intake, our bodies respond by decreasing energy expenditure and increasing appetite to defend our existing weight.

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What are key factors for maintaining weight loss?

Successful long-term weight loss maintenance usually involves two key factors: regular exercise and a low-energy density (low-fat) diet.

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What is fitness?

Fitness is the ability to perform aerobic work, meaning the capacity for sustained physical activity. It's not directly linked to weight, and individuals can be fit regardless of their body mass.

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Can a person be both overweight and fit?

While it's possible to be overweight or obese and fit, it's not as common as being thin and unfit. Sumo wrestlers are a classic example of fit individuals with high body fat.

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Why is fitness important?

Maintaining a healthy body weight is important for overall health, but focusing on fitness is equally crucial. Fitness contributes to better health and can enhance quality of life.

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What is GLP-1?

A naturally occurring hormone produced by the gut that helps regulate blood sugar levels by stimulating insulin release and slowing gastric emptying.

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What makes Extendin-4 unique?

A naturally occurring hormone that is resistant to breakdown by enzymes, making it more effective for longer.

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What is the 'Intestinal Brake' effect?

GLP-1's ability to reduce appetite and promote fullness.

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What is the first GLP-1 drug?

A drug derived from the saliva of the Gila Monster and approved for treating diabetes.

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What are increased Triglycerides?

A potential side effect of high carbohydrate intake, particularly fructose.

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Who are sensitive people?

Individuals who are more susceptible to negative health effects from high carbohydrate consumption.

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What is eGFR?

A measurement of how well the kidneys filter waste from the blood.

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What are the benefits of GLP-1 treatment?

The ability of GLP-1 to promote weight loss, lower blood sugar, and improve cardiovascular health.

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Cardiorespiratory Fitness (CRF)

The ability of the body to efficiently use oxygen during physical activity, reflecting the capacity of the heart, lungs, and blood to deliver oxygen to working muscles and the muscles' ability to utilize the oxygen.

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Skinny Fat

A condition characterized by having a high amount of body fat despite appearing lean. These individuals may have a seemingly low BMI but still experience increased risk of chronic diseases.

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Resting Energy Expenditure (REE)

The energy used by the body at rest, primarily determined by lean body mass, especially muscle mass.

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Metabolic Syndrome

The ability of the body to use and store energy effectively, often related to the presence of adequate insulin sensitivity and efficient glucose utilization by cells.

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Diseases associated with Overweight/Obesity

A complex group of diseases and conditions often linked to being overweight or obese. They include diabetes, heart disease, stroke, certain cancers, and other metabolic disorders.

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Dyslipidemia

A health condition where a person has very high levels of bad cholesterol (LDL), low levels of good cholesterol (HDL), and other lipid abnormalities.

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Multiple Risk Factor Syndrome

A condition that involves several risk factors for cardiovascular disease, including high blood pressure, high cholesterol, insulin resistance, and abdominal obesity.

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Synergistic effects of Multiple Risk Factors

Increased risk of developing a disease due to the presence of multiple risk factors, even if each individual factor is only moderately elevated.

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Study Notes

Obesity Statistics

  • Obesity is increasing globally, rising from 15% in 1976-80 to 33% of US adults now.
  • It's common in youth.
  • Obesity is strongly associated with cardiovascular disease, diabetes, liver disease, and other serious illnesses.
  • It's a leading cause of death worldwide.

Obesity Definition and Measurement

  • Obesity is a disorder characterized by excess body fat relative to lean tissue mass.
  • It's generally identified through body weight or BMI (Body Mass Index = kg/m²).
  • BMI > 30 is considered obese, and BMI > 27 overweight.
  • BMI is not perfect as it doesn't account for muscle mass, so other measures may be used. Obesity is determined by body fat stores, not muscle.

Obesity Demographics

  • Obesity prevalence is higher in lower socioeconomic groups in developed countries, compared to wealthier groups.
  • This trend contradicts past patterns.
  • Poorer populations have an increased occurrence, not a decreased one.
  • Minority groups in the US, and populations in countries such as Asia, South America, and parts of Africa/Europe have significantly higher prevalence rates (some over 70%).
  • Youth are experiencing a rapid increase in incidence.

Diseases Associated with Obesity

  • Obesity is connected to various diseases, including cancers (colon, prostate, breast), sleep/breathing disorders, high blood pressure, gall bladder disease, dyslipidemia, reproductive dysfunction, cardiovascular disease, stroke, liver disease (NAFLD), and depression.
  • Obesity significantly impacts cognitive function, and is a risk factor for Alzheimer's.

History of Nutrient Supplementation

  • Fortification of niacin in bread eliminated the prevalence of pellagra (1906-1920).
  • Vitamin D supplementation in dairy products and other foods reduced rickets.
  • Iodination of salts prevents endemic thyroid disorder (cretinism).
  • Supplementation with thiamine corrected beriberi.
  • Vitamin C supplementation prevented scurvy.
  • Iron and folate administration reduced anemia, especially in women.
  • Vitamin B12 injections resolved pernicious anemia.

General Overview of the Gastrointestinal Tract (GIT)

  • The GIT is the gateway for food to become nutrients.
  • Accessory organs include salivary glands, liver, pancreas, and gallbladder.
  • Salivary glands produce fluids that lubricate food and begin starch breakdown.
  • Submaxillary (mandibular) glands produce mixed serous and mucous secretions to aid in digestion.
  • Other organs, like stomach, small intestine, liver, gallbladder, bile ducts, and pancreas, are linked by nerves (Vagus nerve and pelvic nerve) coordinating functions.

Digestive Process Phases

  • Cephalic phase: sight, smell, or thought of food stimulates gastric secretions (preparing the body to digest).

  • Gastric phase: food entering the stomach increases gastric secretion and motility. Stomach acid helps with protein breakdown, and enzymes (like pepsin) are released. G.I. hormones stimulate and slow the various stages of digestion.

  • Intestinal phase: Stomach contents empty into small intestine causing the intestine to expand and trigger hormones to slow gastric secretions. Intestine then releases digestive hormones/chemicals in the small intestine.

Foods and Macronutrients

  • Foods must contain macronutrients (carbohydrates, protein, fat, minerals, and vitamins).
  • Calories from carbs (CHO), fats, and proteins differ.
  • Excess calorie intake beyond the body's requirements for energy expenditure can lead to weight gain.

Metabolic Fate of Carbs

  • The body stores carbs in the form of glycogen.
  • Excess sugars can be converted into fatty acids.
  • Glucose oxidation is converted to energy.

Diabetes Mellitus

  • Type 1 diabetes occurs when insulin is not produced by the body,
  • Type 2 diabetes involves insulin resistance due to the insulin receptors not responding to the hormone's signal to uptake glucose.
  • Gestational diabetes appears during pregnancy, usually reversing after the birth.

Protein Deficiency

  • Protein deficiency is uncommon in the US.
  • Animal products are a primary source of protein alongside grains and vegetables in the typical diet.

Other Crucial Information

  • Obesity is related to numerous, potentially life-threatening diseases.
  • Dietary modifications and exercise can play a crucial role in preventing and managing conditions related to obesity or weight gain.

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