While it is generally accepted that med schools do not care what major you are, I have a general rule that I follow:
4.0 + major you like > 4.0 in a major you don't enjoy > low gpa + major you don't enjoy
Ideally you want to be in the first category, and that's generally the case with a strong work ethic and determination. However, it's also generally accepted to avoid being a nursing major, due to taking a spot away from nursing school for someone who actually wants to go into the field and the same can be said for health sciences.