I give all new members one piece of advice when they get started and it's this,"Don't look at good health or weight loss with an all or nothing mentality". if the only healthy thing you do for yourself today is drink 8 glasses of water, that's still a step in the right direction.
Good health isn't all or nothing. Every little bit DOES make a difference even if it's only drinking your water or taking a daily walk.
Being in medical school isn't easy. I have a cousin who's an MD. she told me how she had to read for hours and hours each day. Finding the right balance won't be easy. that's why Spark People encourages its members to start with small steps first. Don't try to do everything at once or you will end up frustrated.
Starting with 10 minutes of exercise each day really is a good start. Keep in mind that even if you can't exercise for 10 minutes, there are ways to make your day more active. Take the stairs instead of the escalator. If you take a bus or subway, get off one or two stops before and walk the extra way. If you drive to the mall, park at the far end of the lot and walk the extra way. if you take an elevator, get off one or two floors before and walk up the stairs. Those are simple things you can do to make your day more active. Which is the point of exercise.
As you'll learn in classes, the benefits of exercise to the human body go beyond burning X calories in Y time. Regular exercise can not only decrease your risk for diabetes and osteoporosis, it can also reduce depression as well increase your immune system. Being active is an important part of being healthy inside and out.
Take things slowly so that you don't feel overwhelmed.