important to stay as fit as possible.
World Champion, Mikhail Botvinnik was firm believer in staying in shape and avoiding smoking, drinking to be as sharp as possible in his chess.
Whereas Alekander Alekhine and Mikhail Tal were alcoholics. Alekhine was said to have been drunk for several games in his first world title match with Euwe -- that he lost. In the rematch, Alekhine refrained from drinking and soundly defeated Euwe.
I never heard that height made any difference in chess abilities / potentials.
Just saw this photo and looks like caruana is 5 ft 5 as mickey adams is listed as 5 ft 5 and they both have the same height,while Carlsen is 6 ft i guess