Attention to health is important. How people appear lets us know how much they value themselves. If they "let themselves go" what else would they let go? Appearance isn't just about beauty/good looks. It is about healthy. Lack of self-control would worry me. Whether it were physical/emotional/intellectual/verbal . If you can't control yourself why should I believe you can control the things you are charged to do for the we the people as prez?
