Why Are Vitamin Deficiencies Increasing? One major reason is the shift toward indoor living. Most people spend long hours inside offices, homes, or in front of screens. This significantly reduces sunlight exposure, which directly affects Vitamin D production in the body. Another important factor is the rise of ultra-processed foods. Modern diets are often calorie-rich but nutrient-p... https://www.freedomfromdiabetes.org/blog/post/vitamin-deficiency-symptoms-causes-treatment/5269