So, I get daily emails from the Academy of Dietetics and Nutrition for being a member and every now and then I actually look at the links at the bottom of the email and thought that everybody could use this one. It's the Journal of Nutrition website full of peer-reviewed scientific literature. As far as I can tell, it's free. I'll keep adding links for websites like this as I find them.
Enjoy
Journal of Nutrition
Enjoy
Journal of Nutrition