I am a vegan, so my body gets a lot of its vitamin D when I am exposed to the sun. Must the sunshine be absorbed 鈥渄irectly鈥�, or can I get the benefit when it arrives through glass windows? How much do I need per day?
Colin Brown, Edinburgh, UK
We pay 拢25 for every answer published in New 杏吧原创. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.
Advertisement
This article appeared in print under the headline 鈥淟ight snack鈥�