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.
The recommended adequate intake for pregnant women is the same as for non-pregnant adults. Most prenatal vitamins provide 400 IU of vitamin D daily as cholecalciferol, while high-risk populations may benefit from higher amounts (2,000-4,000 IU daily). Use cautiously in breastfeeding women. The daily recommended intake for vitamin D during breastfeeding is 400 IU (10 micrograms) daily. Vitamin D2 in doses of 2,000 IU daily or 60,000 IU monthly for three months has been found to be safe and effective. Exclusively breastfed babies may be supplemented with 400-2,000 IU daily.