Congratulations on your hard work and success! Your test scores are very high and grades good. What is your UW GPA?
All the schools on your list are obviously terrific. They are also extremely competitive. I like to use this example: a tip-top LAC told us that 70% of applicants were fully qualified, and the school thought they would succeed in every way if accepted. It accepted 14%. So 4 in 5 fully qualified applicants were not accepted. It’s just supply and demand.
Brown and Dartmouth accept single digits in RD. UNC only takes a small % of OOS students, so is very tough for OOS students. Wash U accepts a large % of its incoming class in ED, so RD acceptance % is low, and it puts a big emphasis on “Interest”–visiting the school and interviewing if possible. I love Tufts. BU seems good for your interests. Tufts and BU and the other schools in Boston have received increasing numbers of applications in recent years. GWU and Purdue seem more like matches for you, but not guarantees. GWU can be very expensive (more limited aid), if cost is a factor.
I’m not trying to be negative, just realistic. High-stat students might be accepted to any of these, but also might be denied admission to most or all of them, just because of the high number of applicants. The GREAT NEWS is that there are many outstanding choices available, and it seems like lots of them will be accessible to your especially if the financial side works.
So I’d advise you keep all of these you love. You are a very reasonable applicant at all of them. AND you add a couple of schools that would be good choices for YOU, would be affordable, and where you have a strong chance of admission. I sort of think of schools with a 40%+ acceptance rate as being safeties for high-stat students, though it can depend on the specific situation. For example, Purdue is higher for all students. It might be for OOS students. You could research that.
A couple of other schools you might explore:
Case Western Reserve University (CWRU “Crew”): Seems like a great fit for you. It is a top national STEM university. Urban like some of your others; mid-size like yours, including Brown, Dartmouth, and Tufts; has nutrition majors and a major med school/university hospital right next to campus. It’s in a nice area of Cleveland with museums, symphony hall, theaters, etc. right adjacent. There is also a music school right next to campus (you probably pass walking from freshman dorms to main academic quad) (see link), so you might have opportunities there. Not a safety, maybe more of a high match.
https://case.edu/medicine/nutrition/education-programs/undergraduate-programs-in-nutrition
https://www.cim.edu
Indiana University: You are considering Purdue, which is great, and just a couple of hours from Bloomington (IU). It has a very nice state flagship campus in a nice college town, with a pretty natural area (Brown County) nearby, nutritional science program, and one of the VERY BEST music schools among state universities. It has a very large population of international students, including many from China, if that is a plus for you.
https://www.indiana.edu/academics/degrees-majors/degree/nutrition-science-bs-iu-bloomington-ahnsbs
https://music.indiana.edu
University of Pittsburgh: Large urban school, probably fairly comparable to BU, but not in Boston, so fewer applicants in recent years, still competitive admissions, excellent students and programs. It has a new nutritional sciences program starting next year.
https://www.shrs.pitt.edu/ns
I’d think your odds pretty high at Pitt and IU but obviously I can’t say for sure.
Good luck!