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.
1 Women over 50 need 2.4 micrograms (mcg) of vitamin B12 and 1.5 milligrams of vitamin B6 each day. Ask your doctor if you need a vitamin supplement.  After menopause, a woman's calcium needs go up to maintain bone health. Women 51 and older should get 1,200 milligrams (mg) of calcium each day. Vitamin D also is important to bone health. Women 51 to 70 should get 600 international units (IU) of vitamin D each day.