In Plato’s Republic, Socrates says that guardians must be given a simple diet so they do not think too much about their health. Physical exercise is sufficient care for the body.
But the more fastidious a man is about his diet, the more likely he is to pay “excessive attention to his body,” and there is “no [greater] impediment” to a man being able to carry out his duty than his constant concern for his health.
2400 years ago, Plato understood us.