AFAA Personal Trainer Certification Practice Exam

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How many calories are found in 1 gram of protein?

4 calories
7 calories
9 calories
5 calories

The correct answer is: 4 calories

Protein is one of the three macronutrients essential for human nutrition, along with carbohydrates and fats. Each gram of protein provides 4 calories of energy. This is a fundamental concept in nutrition, as understanding the caloric value of macronutrients helps in creating balanced diets and meal plans. Calories from protein are vital for various bodily functions, including muscle growth and repair, enzyme production, and hormone regulation. The body utilizes protein to build and repair tissues, and understanding its caloric content is crucial for anyone looking to manage their weight, enhance athletic performance, or maintain overall health. In contrast, the other figures provided do not accurately represent the caloric value of protein. Fats provide more calories per gram, specifically 9 calories, while carbohydrates match protein at 4 calories per gram. The choice of 5 calories does not correspond to any established value for macronutrients and is therefore incorrect. This focus on knowing the calorie content of protein is crucial for both personal training and effective nutrition planning.