Is the vegan diet the most healthy diet?

Depends...: ...On who you ask. People who believe in the diet may swear by it, but there are plenty of knowledgeable people who believe that you can still eat meat, chicken, and fish and live to 100. Just ask the sardinians in italy who have been doing so since the bronze age. Vegans also need to supplement with vitamin b12.

No: If you undertake this for moral reasons, out of concern for animals and revulsion to factory farming (which i share), then hurrah for you, this is a good thing. You also need to know that if you don't supplement heavily, or don't know exactly what you are doing, you will ruin your health quickly. The vegan community is full of both good people and totally dishonest crooks. Be wise.

Not really: The long term effect of a low fat, vegan diet is malnutrition. Used for a short time (4-6 weeks) a low fat diet can be employed for weight loss. However, the long lerm effects of low fat diets are miserable. A low fat - high carb diet will lead to high Insulin levels, high triglcyerides, low hdl, metabolic syndrome and finally high blood pressure, diabetes and heart disease.