Since he works really hard, his determination caiuses him to have a lot of focus and concentration on himself. Forgetting the other things in life, working real hard 日 and night trying to be the best. I can't say for sure about it, cause the 作者 never showed a side of him resembling that. Just cause the authors don't 显示 it, doesn' t mean he doesn't do it. They often 显示 the charectors brushing, eating 或者 any of the hygienal practices, but that doesn't mean they don't do that. So it can go either way
