AFAA Personal Trainer Certification Practice Exam

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What is the primary function of dietary fiber in the body?

Boosts energy levels
Aids in digestion
Increases muscle mass
Promotes fat storage

The correct answer is: Aids in digestion

The primary function of dietary fiber in the body is to aid in digestion. Fiber is a type of carbohydrate that the body cannot fully digest. It plays a crucial role in promoting regular bowel movements and preventing constipation by adding bulk to the stool and facilitating its passage through the digestive tract. Additionally, fiber can help regulate blood sugar levels and lower cholesterol, contributing to overall digestive health. Understanding the function of dietary fiber highlights its importance in maintaining a healthy digestive system. Unlike the other options, which relate to energy production, muscle growth, or fat storage, aiding digestion is the fundamental role of dietary fiber, making it essential for proper gastrointestinal function.