Vignette #1 John has started working out at the local gym and has been buying protein-packed snack bars and other high-protein foods. He started at 180 pounds and has increased his weight to 195 pounds. He is convinced the extra weight is all muscle. His wife, Jill, thinks that there may be risks involved with eating extra protein. They decide to find out more about how much protein they need and explore the risks associated with consuming too much as well as too little protein.  Based on your text, answer the following questions. Jill and John are out to dinner and deciding what to order. Which choice most closely follows the guidelines from your text for selecting healthy protein sources?

According to the Dietary Reference Intakes (DRI), _________ of the calories in a balanced diet should be obtained from protein.

The main function of vitamin D is ____.

Marta tries to avoid sugar because she believes it is responsible for making her overweight, giving her husband diabetes, and causing hyperactivity in her grandchildren. What condition has verifiably been linked to sugar by research studies?

What helps keep the body from consuming its vital tissues for energy in a prolonged diet or starvation?

__________ increase(s) both total cholesterol and LDL-cholesterol.

Twins raised by adoptive parents tend to have body shapes similar to their biological parents. This supports which theory of obesity?

The more fit a muscle is, the ____ it can burn for energy when oxygen is present.

Susan is deciding what to order for lunch at the fast-food restaurant near her school. Which combination would you recommend as the best nutritional selection?

Vignette #1 John is 35 and interested in gaining muscle mass and decides to check out the nutritional supplements at the local health food store. The clerk approaches him wearing a white lab coat; this immediately impresses John, who now thinks that the clerk is well informed. John explains that his goal is to gain the maximum muscle mass in the shortest time. The clerk is eager to assist John and says, “Let me show you the products that will benefit you most.” Let’s see if the clerk really knows what ergogenic aids are all about by answering these questions. The clerk recommends John purchase creatine. Which statement describes a false claim attributed to this substance?