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).
Good sources of protein can be hard to find if you're a vegan. But, adding protein to a meatless diet isn't as hard as you think, even if you don't eat dairy or other animal products. Vegetable sources of protein are plentiful and easy to add to a vegan diet if you have some basic knowledge of nutrition. Here are some good sources of protein that even vegans can eat. 1. Nuts and Seeds. Nuts and seeds are very good sources of protein for vegans. Nuts provide plenty of protein, as well as other nutrients like vitamins A and E, phosphorus, potassium, fiber and essential fatty acids.