I suggest to anyone contemplating about choosing a major to decide with one thing in mind, asking: "what interests me?" Honestly, majoring in what you like is more important than searching for something that may look "good" with the admissions committee. You'll thank yourself later for it! Your experience in college will be more pleasant and your grades will reflect it. You're going to take biochemistry, etc. in medical school, take something you couldn't possibly in med school but possible in undergrad. For example, anthropology, philosophy, history, sociology, etc. Of course, if you love chemistry and biology, by all means, major in them. I hope this helps.