Any vegans here?

I had a doctor a few years ago, tell me about the downfalls of being a vegan. He said the human body was designed to be a carnivore, and how certain vegetation really messed up your system. He had several charts on the subject, and made a lot of sense. According to him, the healthiest people on the face of the earth, with the lowest rate of cancer, heart disease, and diabetes, are the Eskimo. They have very little vegetation, and survive mostly on meat with a high fat content.
The Eskimos eat "unprocessed meat" which very different from the meats we buy at the grocery store. The good Salmon/Seals they eat are fresh and wild while our Salmon is grown on a fish farm. I buy grass fed beef for my hamburgers and try to buy meats that have the least amount of processing. Same goes for eggs!! Farm (free range) eggs have 1/3 less cholesterol than store bought eggs and they have more vitamins/minerals.