My grandmother used to lie under a special light every day - don't know if it was a tanning light or what, but she needed to cover her eyes. And she never looked tan - very pale. This was back in the early 60's. She was also very obese, so I doubt if light takes care of everything.

On the other hand, I started using a light therapy lamp for SAD last spring. I use it daily & this has been my best winter ever! No depression & plenty of energy. Not losing weight - but would it only be where the light hits? In which case the right side of my face should be thinner.