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).
2,000 Calories a day is used for general nutrition advice, but calorie needs may vary. Additional nutritional information available upon request. At Panera, items designated as vegan have no animal sources: no meat, fish, shellfish, milk, egg or honey products, and no enzymes and rennet from animal sources. All items are prepared in the same kitchen area where non-vegan products are prepared.