Monosaccharides, disaccharides, and polysaccharides; they differ by chain length and the number of glycosidic bonds linking sugar units

Simple sugars and complex sugars; they differ only by taste and sweetness

Glucose, fructose, and galactose; they differ in caloric value per gram

Starches and fibers; they differ because starch has no chemical bonds while fiber has many

Conversion of glycogen to glucose in muscle to fuel sprinting during exercise

Synthesis of glucose from non‑carbohydrate precursors (such as lactate, amino acids, and glycerol) primarily in the liver during fasting to maintain blood glucose

Breakdown of glucose to pyruvate to rapidly generate ATP during high‑intensity activity

Formation of glycogen from dietary glucose in the postprandial state to store energy

Saturated fats contain only single carbon–carbon bonds and are typically solid at room temperature, whereas unsaturated fats contain one or more double bonds and are more often liquid

Saturated fats always come from plants, whereas unsaturated fats always come from animals

Saturated fats supply fewer calories per gram than unsaturated fats

Saturated fats are essential nutrients, whereas unsaturated fats are not required

Leucine, isoleucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine, histidine; they must be obtained from the diet because humans cannot synthesize them adequately

Alanine, glycine, serine, tyrosine; they matter because they are the body’s only nitrogen source

Glutamine, asparagine, cysteine, proline; they are essential because they are used for gluconeogenesis

Arginine, ornithine, citrulline, taurine; they are essential because they form bile acids

$$20.4$$

$$22.9$$

$$24.7$$

$$26.1$$

Underweight

Normal weight

Overweight

Obesity

100 kcal

150 kcal

200 kcal

250 kcal

White bread generally produces a faster and higher postprandial glucose spike than lentils, which raise glucose more slowly and to a lesser extent

Lentils generally raise blood glucose more rapidly and to a higher peak than white bread

Both white bread and lentils have identical effects on blood glucose

Neither white bread nor lentils affects blood glucose because the glycemic index applies only to fats

5–10%

10–15%

20–35%

35–50%

As intensity increases, reliance on fat increases while carbohydrate use decreases

As intensity increases, reliance on carbohydrates increases while fat contribution decreases

Carbohydrate and fat contributions remain constant across all intensities

Proteins become the dominant energy source at high intensity

Lowers LDL cholesterol and raises HDL cholesterol, reducing cardiovascular risk

Raises LDL cholesterol and lowers HDL cholesterol, increasing cardiovascular risk

Has no measurable effect on blood lipids or cardiovascular outcomes

Only affects cardiovascular health when combined with fiber intake

At rest, fat oxidation predominates with a small contribution from carbohydrates and minimal protein; during moderate exercise, carbohydrate contribution increases while protein remains a minor contributor

At rest, carbohydrates provide nearly all energy; during moderate exercise, fats provide nearly all energy

Protein provides the majority of energy both at rest and during moderate exercise

At rest and during moderate exercise, carbohydrates, fats, and proteins contribute equally

It passively reflects stomach fullness without integrating hormonal or neural signals

It integrates signals such as leptin, ghrelin, insulin, nutrient status, and sensory cues to modulate appetite and energy balance

It regulates appetite only through learned behaviors and external cues, not hormones

It controls hunger exclusively via the pituitary gland without peripheral input

Nitrogen balance is determined solely by fluid intake and dehydration status

Nitrogen balance reflects the relationship between dietary protein intake and nitrogen excretion; positive balance occurs in growth or recovery, whereas negative balance indicates catabolism or inadequate intake

Nitrogen balance depends only on carbohydrate availability and glycogen stores

Nitrogen balance is irrelevant because excess amino acids are never oxidized

BMI adjusts for differences in body composition, so it accurately reflects adiposity in athletes

BMI underestimates fatness in athletes because it ignores hydration status

BMI does not distinguish between fat mass and lean mass, so muscular individuals may be misclassified as overweight or obese

BMI is valid only for children and cannot be applied to adults

To provide energy as a primary fuel source

To enhance the absorption of vitamins and minerals

To serve as a building block for muscle tissue

To aid in digestion and promote regular bowel movements

As glycogen in the liver and muscles

As glucose in the bloodstream

As fat in adipose tissue

As protein in muscle tissue

They play a crucial role in reducing inflammation and supporting heart health

They are not necessary for a balanced diet

They are primarily used for energy during high-intensity exercise

They are essential for the synthesis of cholesterol in the liver

It enhances insulin sensitivity and promotes weight loss

It can lead to insulin resistance and increased risk of type 2 diabetes

It has no significant impact on metabolic processes

It only affects dental health and has no other health implications

They are essential for energy production in the body

They help neutralize free radicals and may reduce oxidative stress

They are primarily found in animal products and are not necessary for plant-based diets

They are only beneficial when consumed in supplement form

Only carbohydrates are important for muscle recovery post-exercise

Increased protein intake enhances muscle protein synthesis and recovery

Protein intake has no effect on muscle recovery or growth

Protein should be avoided after exercise to prevent fat gain

To serve as the main building blocks for muscle tissue

To enhance the absorption of fat-soluble vitamins

To regulate body temperature and hydration

To provide a quick source of energy for the body

Fiber helps to regulate bowel movements and prevent constipation

Fiber is only beneficial when consumed in supplement form

Dietary fiber is not important for digestive health

Fiber can lead to digestive discomfort and should be avoided

It suppresses appetite and reduces cravings for other foods

It only affects appetite when combined with high-fat foods

It can lead to increased hunger and cravings for more sugar

It has no effect on appetite or cravings

To provide a quick source of energy during high-intensity activities

To serve as a major energy reserve and support cell structure

To enhance the absorption of water-soluble vitamins

To act solely as a building block for muscle tissue

Protein is primarily converted to glucose to maintain blood sugar levels

Protein is used exclusively for muscle repair and growth

Protein has no significant role during fasting periods

Protein is stored as fat for future energy needs

They can lower cholesterol levels and reduce the risk of heart disease

They primarily affect digestive health without influencing cardiovascular outcomes

High-fiber diets have no effect on heart health

High-fiber diets are only beneficial when combined with low-fat diets

To provide a source of energy during exercise

To aid in digestion and prevent constipation

To enhance the absorption of fat-soluble vitamins

To serve as a building block for muscle tissue

Vitamins are only important for immune function

Vitamins are not involved in energy metabolism

Vitamins act as coenzymes and are essential for energy production processes

Vitamins provide direct energy to the body

Protein intake is irrelevant to muscle recovery timing

Consuming protein immediately after exercise enhances muscle recovery

Timing of protein intake has no impact on muscle growth

Protein should be consumed only before exercise for optimal recovery

Refined grains are better for maintaining stable blood sugar levels

Whole grains are less filling and lead to increased hunger

Refined grains are more nutritious than whole grains

Whole grains provide more fiber and nutrients, which can improve digestive health

Low-protein diets are more beneficial for muscle gain

High-protein diets can promote greater satiety and help preserve lean muscle mass during weight loss

There is no difference in weight loss effectiveness between high-protein and low-protein diets

High-protein diets are less effective for weight loss than low-protein diets

They provide energy for physical activity

They help to neutralize free radicals and reduce oxidative stress

They are primarily responsible for muscle growth

They have no significant health benefits

40-50 grams

60-70 grams

25-30 grams

5-10 grams

Proper hydration enhances endurance and reduces fatigue

Dehydration has no impact on performance

Hydration only affects performance in high temperatures

Excessive hydration can lead to improved performance

To serve as a building block for muscle tissue

To support metabolic processes and maintain health

To provide energy for physical activities

To act solely as antioxidants

It helps in maintaining a healthy weight by providing quick energy

It has no significant impact on weight management

It can lead to weight gain and increased fat storage

It promotes sustainable weight loss and improved metabolism

They have no effect on heart health

They can reduce inflammation and lower the risk of heart disease

They primarily contribute to muscle growth

They are only beneficial when consumed in large quantities

They have no significant health benefits compared to processed foods

They are primarily a source of protein

They help to ensure a diverse intake of vitamins, minerals, and antioxidants

They provide a limited range of nutrients

Carbohydrates, as they provide quick energy through anaerobic metabolism

Proteins, as they are the main fuel during intense workouts

Vitamins, because they enhance energy production

Fats, since they are the most abundant energy source

Hydration is only important for endurance athletes

Proper hydration helps maintain performance and prevents overheating

Hydration has no impact on exercise performance

Drinking water is unnecessary if you consume enough food

It only affects physical appearance, not health

A balanced diet supports optimal body function and reduces disease risk

It has no significant impact on health outcomes

A balanced diet is only important for athletes

It lowers LDL cholesterol and raises HDL cholesterol

It only affects cholesterol levels when combined with high sugar intake

It has no effect on cholesterol levels

It raises LDL cholesterol and may increase the risk of heart disease

Calcium is only important for muscle function, not bone health

Calcium intake is only beneficial when combined with vitamin D

Higher calcium intake is associated with increased bone density and reduced fracture risk

Calcium intake has no significant effect on bone density

Probiotics are only effective when taken in supplement form

They help maintain a healthy balance of gut bacteria and may improve digestion

They have no impact on digestive health

They primarily aid in nutrient absorption