Well I’m sure you’ve heard this before…you can major in anything and still get into med school as long as you take the required courses for med school, MCAT, and your GPA is decent (shoot for a 3.5 or higher). One thing is that the med school will probably look at how strenuous your schedule is–I’m not marketing major and excuse me if I’m way off, but I don’t think its one of the more strenuous majors. Have you considered economics? I’ve heard that economics majors have really good graduate school placement rates. However, if marketing may be your thing, go for it!! Best of luck!

Go right ahead. Do something you know you’ll do well in, so that if you want, your grades will be high enough to go to medical school, or to instead get a masters in business.