First I admire you for even considering a double major given the rigorous demands of medical school. Having said that many medical schools actually offer MD/MBA programs recognizing the importance of physicians to have a solid foundation in business management. I would encourage you to look for programs such as this, it will not only help you in your medical career but personally as well. I included a couple hot links for you to review, the mdmbaprograms.org actually lists all medical schools offering dual programs. I hope you find this helpful and wish you the best of luck.
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However, you can minor in whatever you are interested in as well, it would be lighter coursework and you can still do something you love. My sister loves English but she ended up getting her degree and Master's in Biochemistry however she was able to minor in Literature. I also was a Psychology major but minored in Chemistry as well. Do what you love but make sure to do well in classes and always speak with your premed adviser on your path to medical school.
Best of Luck!
Pick a major that interests you. You will need to get good grades in college in order to apply for medical school. At the medical school I attended, the average GPA is reported to be 3.85, so even one or two B's can hurt your chances of acceptance.
Health informatics is a specialization that links IT, communications and healthcare to improve patient care. There are physicians that I work with that specialize in this area and they are an asset to the organization in which I am currently working. These are just a couple of ideas and wishing you well in your studies.