www.nutritionandmetabolism.com : This site gives access to tons of free academic articles focused on, you guessed it, nutrition and metabolism.  I’ve found an inexhaustive goldmine on the latest research into Cancer, Diabetes, Heart Disease, and even Alzheimer’s.

www.lowcarbluxury.com : This site has some information pertinent to low-carbers.  I use the site mostly for recipes.  However, I would take some of its research with a grain of salt unless you’ve been frequenting the actual research some of their information is based on.

www.nutritiondata.com : This is the site I primarily use to calculate my nutrient intake.