Vitamin A plays an important role in: 

The principal food source of chloride is:

A person who continues moderate-intensity activities for more than _____ minutes begins to use less glucose and more fat for fuel.

An athlete may use up to 80 percent of the total daily energy expenditure to maintain regular body functions.

Leptin is a hormone produced by the body to stimulate appetite and encourage eating.

Which of the following is NOT a characteristic of vitamins B and C? 

For men and women in the 19- to 50-year age range, the calcium DRI is _____ mg.

Athletes who lose a great deal of sodium in their sweat may be prone to:

The ability of the vital organs and metabolism to sustain moderate to high-intensity muscle exercise for prolonged periods is called _____. 

The Food and Drug Administration (FDA) must ensure that the U.S. food supply meets all of the following criteria EXCEPT being: