Health is more important than beauty: your health is more important than your beauty.
Students focus on learning and don't care too much about appearance and other people's opinions; Now, you are a student, so your first task is to study. You shouldn't care too much about your appearance or other people's opinions.
You can keep healthy through more exercise and change bad eating habits; Only when you change your bad eating habits and keep regular exercise can you have a healthy baby.
Finally, I used the related words commonly used in composition in the form of writing, which looked more natural and more like your own writing.