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).
Vegan foods lack any significant amount of cholesterol, which is linked to heart disease. They also can include nutrients vital to our health, including fiber and antioxidants, which provide good colon health and aid in preventing numerous diseases. But while vegan diets can be healthy, they arenât necessarily. In a world where processed foods have taken over our grocery stores, all diets, including vegan, can be inundated with unhealthy foods. The first major difference I see between a healthy and unhealthy vegan diet is the lack of important nutrients.