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29 percent of adults have low levels of vitamin D between January and March every year and are consequently risking deficiency, according to the National Diet and Nutrition Survey. For 11–18-year-olds, this jumps to 37 percent. Given the nutrient’s vital role in keeping muscles, bones and teeth healthy, what would deficiency mean for you and can you prevent it by taking supplements? Known as the ‘sunshine vitamin’ because the body creates it from direct sunlight, vitamin D is only found in a small number of foods. It’s pretty much impossible to get the recommended daily dose from the sun between October and...