They claim that it is healthier not to eat meat. They will even go so far as to suggest it is inhumane to eat animals. And so they won't eat meat.
Meat is foremost an exellent source of protien.
Most commonly eaten are the muscles of the animal. In their early times, the Scandinavian countries offered their inhabitants very little vegetable matter to their people. They, the Vikings, were some of the largest and healthiest people of the times. Eskimo's, through today, have been known to exsist strictly on meat. They have the lowest sickness rate, and the longest life expectancy, of any group of people on the planet today.