Does anyone have any advice where to look for a good refresher on nutrition? Apparently I know nothing about this subject because it is repeatedly in the "lower performance" section on NBME. I take Step 2 in ten days. Thanks!
BRS Path is a good suggestion for nutritional disease (kwashiorkor, marasmus etc.)
You could also try Lippincott's Biochem for vitamin deficiencies etc. and the Peds book of your choice for chapters on more nutritional disease, growth and developmental charts and so on.
I'd also check out the Psych chapter on eating disorders (anorexia, bulimia, know how to calculate the BMI) and Family Med sections on diet-controlled hypertension and diabetes.