So my fav player is Hikaru. I'm American too. He's still young enough and healthy but you see him late night games and he seems to be a fan of junk food(no offense) so am I. A nutritionist, some cardio, vitamins. Supposed to be more focused, less fog, think quicker, and recover faster? If I were a real player I'd look for an edge anywhere.
Nutrition, rest and chess
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Having a clear, rested mind means a stronger ability to focus. Exercise definitely helps. Anything to stimulate the mind and blood flow.