Most shark attacks occur less than 100 feet from the shore. More people are killed by bee stings and lightning than by shark attacks. Worldwide about 30 people die each year from shark attacks, which means a person has a one in 300 million chance of being killed by a shark. A shark attack most often occurs when a shark mistakes a person for a seal or other animal.
The new 2010 recommended daily allowance (RDA) is 600 IU for those 1-70 years of age and pregnant or breastfeeding women, and 800 IU for those over 71 years of age. An adequate blood level of vitamin D is 20 nanograms per milliliter, which can be achieved through daily skin exposure to sunlight.
Recommended Intakes. Postmenopausal women, especially those older than 70, should increase their daily vitamin D intake from 15 micrograms, or 600 IU, to 20 micrograms, or 800 IU, according to the National Institutes of Health Office of Dietary Supplements.he National Osteoporosis Foundation recommends even higher daily intakes of 800 to 1,000 IU of vitamin D. Since the Institute of Medicine sets the tolerable upper intake level -- the maximum amount of a nutrient likely to pose no health risks -- at 4,000 IU per day, women can safely take these increased amounts.