Macronutrient Science Fundamentals Flashcards

A client aiming for muscle hypertrophy is resistance training 4-5 days per week. Based on current scientific consensus, which of the following daily protein intake ranges is most effective for maximizing muscle protein synthesis?

Answer: 1.6 - 2.2 g/kg of body weight

To maximize muscle protein accretion with resistance exercise, daily protein intakes should be approximately 1.6 g/kg/day and up to 2.2 g/kg/day. Intakes below this range may not be sufficient to optimize the hypertrophic response to training, while intakes significantly above this range have not been shown to provide additional benefit for muscle growth.

Which of the following best describes the primary role of dietary fat for an athlete?

Answer: To aid in the absorption of fat-soluble vitamins and serve as an energy source for lower-intensity exercise.

Dietary fat is crucial for athletes as it facilitates the absorption of vitamins A, D, E, and K, protects vital organs, aids in hormone production, and serves as a key energy source during lower-intensity, longer-duration activities. While carbohydrates are the main fuel for high-intensity exercise, fat is the primary fuel for rest and low-intensity work.

A client is preparing for a short, high-intensity event (e.g., a 400-meter sprint) and wants to know the best type of carbohydrate to consume for quick energy. Which of the following would be the most appropriate recommendation?

Answer: Simple carbohydrates, like a sports drink or gel, because they are rapidly digested and absorbed.

Simple carbohydrates (sugars) like glucose are the body's preferred and most rapidly absorbed fuel source, making them ideal for immediate energy needs during high-intensity efforts. Complex carbohydrates take longer to digest and are better suited for providing long-lasting energy for meals, not immediate pre-event fuel.

What is the key difference between the Glycemic Index (GI) and the Glycemic Load (GL)?

Answer: GI ranks how quickly a food raises blood sugar, while GL accounts for both the speed and the amount of carbohydrate in a serving.

The Glycemic Index (GI) ranks carbohydrate-containing foods based on how quickly they raise blood glucose levels. The Glycemic Load (GL), however, is a more comprehensive measure because it considers both the GI of the food and the amount of carbohydrates in a specific portion size, giving a more practical indication of a food's effect on blood sugar.

A client is following a well-structured macro plan but is experiencing fatigue and poor recovery after workouts. They mention they are avoiding all fats to keep calories low. Which physiological process is most likely being negatively impacted by the lack of dietary fat?

Answer: Hormone production and nutrient absorption.

Dietary fats are essential for several critical bodily functions beyond providing energy. They are integral to the production of hormones, including testosterone, which is vital for muscle repair and growth. Fats are also required for the absorption of fat-soluble vitamins (A, D, E, K), which play roles in recovery, immune function, and overall health.

Which macronutrient has the highest Thermic Effect of Food (TEF), meaning the body expends the most calories to digest, absorb, and metabolize it?

Answer: Protein

Protein has the highest thermic effect of food (TEF) compared to carbohydrates and fats. This means the body burns more calories processing protein than it does with the other macronutrients, which can contribute to a higher overall metabolic rate and aid in weight management.