Consider the biggest animals on the planet: elephants, and buffaloes, and giraffes. These are vegetarian animals. They grow to thousands of pounds of muscle and bone without ever eating cheeseburgers and pepperoni pizzas.

All red meat contains saturated fat. There is no such thing as truly lean meat. Trimming away the edge ring of fat around a steak really does not lower the fat content significantly. People who have red meat (trimmed or untrimmed) as a regular feature of their diets suffer in far greater numbers from heart attacks and strokes.

There is absolutely no nutrient, no protein, no vitamin, no mineral that can't be obtained from plant-based foods.