Before a game, I avoid having a heavy meal so that I don't feel sleepy at the board. You eat to be healthy, and that generally takes care of everything. Also, you can't be too finicky, since at tournaments you tend to eat at restaurants here and there. But, as long as you're eating sensibly, it's all good.
Viswanathan AnandI like to keep myself physically and mentally fit before any important match. I usually take a short nap just before the game and do not practice immediately before the tournament.
Viswanathan AnandChess is like a language, the top players are very fluent at it. Talent can be developed scientifically but you have to find first what you are good at.
Viswanathan Anand