Vitamin D and Weight Loss - Shape Magazine: Simply going outside can help a little. When UVB rays hit your skin, your body photosynthesizes D—hence, it’s called the sunshine vitamin. Unfortunately geographic location plays a major role in the UVB rays that you have access to. If you live above the 37th parallel (which is anywhere approximately around San Francisco and Denver or above Tennessee and South Carolina), then the UVB rays won’t be right for you to make vitamin D. And even if you do live in the right place, other factors such as pollution and cloud cover can also impact how much vitamin D you will get while out in the sun.
From a dietary perspective, fatty fish are the major source, and fortified juices, milk, and cereals can also contribute to your daily intake.
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