English Reading Practice - 0001 Vidamin D

I'd just like to practice. Vitamin D, sometimes known as the "sunshine vitamin," is made in the body when the skin is exposed to sunlight. It is known to boost the uptake of calcium and bone formation, and some observational studies have also suggested a link between low levels of vitamin D and greater risks of many acute and chronic diseases. However, it is not clear whether this is a cause-and-effect relationship, so various large trials have been conducted to try to test whether vitamin D supplementation can reduce the risk of developing diseases. Researchers led by Philippe Autier of France's International Prevention Research Institute in Lyon analyzed data from several hundred observational studies and clinical trials, examining the effects of vitamin D levels on so-called non-bone health－including links to illnesses such as cancer, diabetes and cardiovascular disease. They found that the benefits of high vitamin D levels seen in observational studies－including reduced risk of cardiovascular events, diabetes and colorectal cancer－were not replicated in randomized trials where participants were given vitamin D to see if it would protect against illness.