I took intro to nutrition and anatomy and physiology (in addition to general and organic chem) a couple years ago when I was planning on pursuing an additional master's in nutrition and those were the pre-reqs for the program since my previous schooling is all on the arts side.
Those 2 classes were very informational and I learned a ton from them (especially the intro to nutrition one). I'd highly recommend looking into that as a class or even just the textbook to learn on your own.
Unfortunately, I already forgot a bulk of the stuff from chem -- ugh.