Check with your provider at home to see if your existing coverage will cover medical treatment while overseas. Many educational institutions require that students possess medical insurance. Insurance is not always required by schools, but it is strongly recommended for you and any family members in the US with you. Eat regular meals and make sure to have a nutritious and balanced diet.
Sleep is fundamental to a healthy life.
Expect to have a busy schedule while you are studying, so don't forget to get adequate sleep. If you are interested in a particular sport or activity check at your school to see what facilities and teams they have. At a minimum take regular walks to contribute to your general good health. When moving to a new home, familiarize yourself as early as possible with your new surroundings. If you are staying with a host family ask them what areas you should avoid and what areas are safe to go to.