Vitamin D prior to and after birth

Example

50,000 IU Vitamin D every two weeks during most of pregnancy = 3,600 IU average daily

3,600 IU is not enough Vitamin D for breast feeding without supplementing

50,000 IU of vitamin D every week shortly before birth will stock up on vitamin D (7,100 IU average)

Must continue at that same rate until finished breast feeding

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See also VitaminDWiki

Air conditioning - allows avoiding the hot sun

Increased use of multi-media indoors

More indoor jobs - more office workers, fewer farmers

Live in cities - 30% in 1950, 70% in 2050

Want whiter skin - especially women

Fear skin cancer - avoid the sun

Less cholesterol - which the skin needs to produce vitamin D

More Obesity - which makes about 1/2 of vitamin D unavailable