I couldn't live without fruit, we go through piles of it. Gets me going in the morning. Fructose is one of the healthiest readily digestible sugars. Its instant energy, A couple of pieces of fruit in the morning gives me a lot of energy, which I need to have cause I have to be pretty physically active in the AM.
The body definitely needs fat and protein, our brains are mostly fat. But to much meat is definitely bad for you, im sure its bad for me. The average American male has 5 lbs of undigested red meat stuck in their bowel by the time they are 50. We evolved past eating only meat.
Good healthy balance and variety is the way to go.
We eat meat here once or twice a week, all other meals are vegetarian. Healthy and economical.