7-Dehydrocholesterol has significant absorption of UV light at the lowest wavelengths of light found in sunlight (290-310 nm). Hence the need for full-spectrum lamps to emit UV-B radiation (UV-B light is defined here to be light between 290-315 NM).
In rare cases some vegans might not get enough fat or calories to produce adequate amounts of steroid hormones (which are produced from cholesterol). Two studies have shown vegans to have sex hormones on par with meat-eaters (1, 2), but one report showed vegan women to have lower levels of estrogen (3).
A vegan diet relies on plant-based foods including fruits, vegetables, grains, beans, nuts, and seeds. A vegan diet can be a healthful and nutritionally adequate diet; however, a vegan must make sure they eat enough foods with protein, calcium, iron, vitamin B12, and omega-3 fatty acids. Protein is an important nutrient for skin, bone, muscle, and organ health.