I have been wondering about this for a while. Is tanning only for looks? or does the Vitamin D cause your body to loose fat? I did a little research and was amazed how BodyBuilding foods are very high in Vitamin D
Does Tanning Burn Fat
If it does, I suspect it is such a miniscule/negligible amount that it is unnoticeable.
Agree with the sauna statement, though a sauna is probably more effective due to intensity and duration.
Tanning also dries the skin, which
can help reduce acne and also cover up the rest. Also good for camouflaging stretch marks.
If you want the benefits of tanning, sweating, and losing fat, then take off your shirt and cut your lawn with a push mower on a hot, sunny day.