Why don medical and governmental authorities recommend vegetarianism?
There have been some medical and governmental indications of the benefits of vegetarian diets. For example, as long ago as June 1961, an editorial in the Journal of the American Medical Association indicated that a vegetarian diet can prevent 90% of strokes and 97% of heart attacks. The U. S. Senate Select Committee on Nutrition and Human Needs recommended in February 1977 that Americans decrease their consumption of meat and increase their consumption of fruits, vegetables, and whole grains. Also, the 1988 report of the Surgeon General indicated the many negative health effects of meat-centered diets, and recommended an increase in the consumption of plant-based foods. Perhaps more will be done in the future, but the factors given in the previous answer still have to be overcome.