im also a nutritionist (UF graduate). However, i believe the conventional knowledge taught in school is highly biased do to corporate interests in research studies. Ive been reeducating myself, ever since i graduated, with my own peer reviewed research. Accordingly i see vegan and vegetarianism, from a nutritional standpoint, inadequate and dangerous. there are various risks that i wont get into, but i will mention a few:
*vegetarians and vegans (as well as almost all americans) subscribe to the fallacy that saturated fats raise cholesterol, thus causing atherosclerosis, when in fact many saturated fats have protective effects.
*high cholesterol means little with regard to heart disease/atherosclerosis... this includes LDL (unless the individual has a certain type of small ldl sub particle)
*atherosclerosis is in fact highly tied to high poly unsaturated fat intake found in high GRAIN diets/sugar diets (seen with vegetarians and vegans)... polyunsaturated fats are highly unstable (except omega 3`s) and cause free radicals to damage arterial walls-> leads to inflammation -> leads to atherosclerosis
SOOOO...avoiding meat products is pretty senseless as long as they are organic/grassfed/free range AND IN FACT ARE ESSENTIAL TO A HEALTH PROMOTING DIET
HOWEVER, vegetarians and vegans have 2 saving features:
1)high phytosterol intake (antioxidant prevents inflammation and thus atherosclerosis)
2)High fiber in this diet regulates bowel movements and lowers risk of certain cancers
SOO WHATS BEST OF BOTH WORLDS? TAKE THE HIGH VEGES FROM VEGETARIAN DIETS AND COMBINE WITH ORGANIC MEATS = PALEO DIET....i will say though that SOME intake of carbohydrates is necessary and strict adherence to this diet is not ideal in that respect.
SORRY FOR THE LONG LECTURE... but nutrition is my thing... heres a video of a doctor lecturing about these vary topics:
http://www.youtube.com/watch?v=XPPYaVcXo1I
good books for more info: "the great cholesterol con"... "good calories bad calories:"... those should get you started and pissed (if you care)