A book that cost $50 in 1950 was written by a cuban author and he explained that after an extended visit to the states, he and his wife would return home and strip down and lay in the sand/sun all day and burn all their skin and they 100% believed all the toxins they acquired in the states would peel off their bodies and they once again would be healthy and they never mentioned that this hurt them in anyway.
I am sure diet has all to do with tanning verses burning.