What is “feast or famine”?
Humans developed on this type of schedule of food availability.
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In young adults, iron intake tends to be:
a. less than the Recommended Dietary Allowance (RDA) in women and more than the RDA in men. b. more than the RDA in women and less than the RDA in men. c. less than the RDA in both women and men. d. more than the RDA in both women and men.
Which of the following is a characteristic of free radicals?
a. They are destroyed by cigarette smoking. b. They arise from normal metabolic reactions. c. They typically stop chain reactions associated with the production of peroxides. d. They are known to accumulate even in the presence of abundant antioxidant nutrients. e. They are more common in infants and children than adults and the elderly.
People who persistently restrict energy intake by 30% for 30 years can expect to increase longevity by up to how many years?
a. 3 b. 6 c. 9 d. 12 e. 15
What percentage of the total water supply is fresh water?
a. 3% b. 10% c. 25% d. 35% e. 50%