Describe the factors that may interfere with vitamin D synthesis
Latitude, season, and time of day all have dramatic effects on vitamin D synthesis and status. Heavy cloud cover, smoke, or smog blocks the ultraviolet (UV) rays of the sun that promote vitamin D synthesis. Differences in skin pigmentation, latitude, and smog may account for the finding that African Americans, especially those in northern, smoggy cities, are most likely to be vitamin D deficient and develop rickets. Vitamin D deficiency is especially prevalent in the winter and in the Arctic and Antarctic regions of the world. To ensure an adequate vitamin D status, supplements may be needed. The body's vitamin D supplies from summer synthesis alone are insufficient to meet winter needs.
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A measure of the amount at which a nutrient is absorbed and used by the body is termed
a. net utilization. b. bioavailability. c. biological value. d. utilization efficiency.
Calcium is important for:
a. bone structure. b. muscle contraction. c. nerve impulse transmission. d. a and b e. a and c f. All of the above
Yesterday, Jenny ran in a marathon race. While she ran, she drank several large cups of water at water stations along the race course. At the end of the race, she experienced difficulty making it to the finish line. She was confused, and she complained of having a headache and feeling dizzy. Based on this information, Jenny was probably suffering from
A. kidney failure. B. brain cancer. C. water intoxication. D. heat cramps.
Selena is a 21-year-old college student who leads a sedentary lifestyle and who takes in approximately 2000 kcalories per day. The RD working with Selena recommends that she eat 2½ cups of vegetables each day. What vegetable dish would be most appropriate for Selena to meet this need??
A) ?coleslaw B) ?sweet potatoes C) ?tempura vegetables D) ?potato salad