Getting a marketing degree, it is 95% chance that go into sales coming out of college. Not every sales job is as glamorous as pharmaceutical sales and getting a pharma job is near impossible now because most pharma companies are laying off big time....
If you don't think sales is going to be your cup of tea, I would recommend getting an internship in a field/company you would be interested in working for after you graduate. You will have a better chance of getting a straight marketing job with a company that is already familiar with you. In my experience, a product marketing job is tough to land.
Not to burst your bubble, but in the business world you will have a hard time being a "consultant" because you have no real world experience. These are usually people with AT LEAST 10+ years of experience.
An MBA is only as good as the name of the college your get your degree from. Unless you are going to a Top 25 MBA program, I would say save your money. Getting accepted into one of these programs is EXTREMELY competitive. Something like 1 applicant out of 250 gets accepted.
Not 100% sure but nutritionists don't make a lot of money and there is not a whole lot of room for growth unless you have your own business or a nutritionist for high profile clients.
I speak from experience, I have a marketing degree and have applied to MBA programs.