Lack of Enough Vitamin D in Your Diet
If you have vitamin D deficiency, it may be because you’re not getting enough of it in your diet. Vitamin D isn’t a natural component of many foods, especially plant-based foods. Because of this, many people rely more on vitamin D produced on the skin and vitamin supplements for their vitamin D supply.
Strict vegetarians are more likely than other groups of people to consume less vitamin D in their diet. This is because the limited natural sources of this vitamin are nearly all animal-based. Some of the best natural sources of vitamin D include fish and fish oils, beef liver, egg yolk, and fortified milk.
Vegans can compensate for their lack of dietary vitamin D by taking supplements. If you get enough vitamin D from sunlight, be mindful of how many supplements you take.