| > You're never going to get sensible dietary advice on HN. You're never going to get sensible dietary advice, period. Diet is a belief system. Most people, including doctors and health authorities, really just go by clichés, like "eat five a day" or an unspecific "balanced diet". The science on it is poor and forever will be. > If you can't get sun you should eat a variety of food that contains vitamin D. Half an hour in the sun, if you are light-skinned, can get your body to produce about 10,000IU of vitamin D. To get that amount in the diet, you would need to eat more than a pound of the right fish. Diet can get you out of the "severely deficient" range, but almost certainly not into the healthy range. > Here's the advice for England They actually advise supplementation, but they err on the low end. The only way to know if you get enough vitamin D is to do blood tests, people react quite different to different doses and forms. One guy here reports 10,000IUs daily gets him to only 55ng/dl (high end of normal), whereas 5000IUs gets others above 70 ng/dl (possibly harmful). Vitamin D builds up over time, so one test is not enough. |