24 Good Reasons Why You May Need Vitamin Supplements

6. Fad Diets

Vitamins may be severely deficient in unusual diets that miss out on whole food classes. Even the common low-fat diets may be deficient in vitamins A, D, and E if taken to an extreme. To prevent vitamin B12 deficiency, which can lead to anemia, vegetarian diets, which can eliminate meat and other animal sources, must be very skillfully prepared.