Which of the following statements about niacin is true?
A. Niacin is found naturally in many foods and can also be formed in the body from tryptophan.
B. Niacin is considered a vitamin-like substance.
C. Deficiencies of niacin are common in the United States, particularly in children.
D. Niacin supplementation has been shown to optimize exercise performance.
Answer: A
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Using animal data to extrapolate to humans, researchers estimate that it would take a person ________ years of restricting energy intake to 30% of normal, to increase life expectancy by 3 years.
a. 5 b. 7 c. 10 d. 15 e. 30
Which of the following statements is true?
A. Nutrition scientists have established RDAs for all essential nutrients. B. People who consume less than the Tolerable Upper Intake Level of a nutrient have a high risk of developing the nutrient's toxicity disorder. C. People who consume 90% of the RDA for iron regularly are likely to develop an iron deficiency. D. People can have energy needs that are higher or lower than the Estimated Energy Requirement.
Which factor has the greatest impact on food selection for most people in the U.S.?
a. culture b. cost c. religious beliefs d. education e. preference
Which member of the typical person's social group often plays the most powerful role in determining his or her food choices?
a. The father b. The siblings c. The mother d. The friends