Animal source foods (ASFs) are evolutionary foods and provide key nutrients. There is no reason to eliminate their consumption from a health perspective, well on the contrary. People who nonetheless decide to do so on ethical or environmental grounds should keep in mind that the robustness of restrictive diets depends on knowledge, resources, and careful supplementation.
Turning people to vegans, there is a loss: their diet suffers from lack of essential amino acids and lipid-soluble vitamins (A, D, E and K).
This is the reason that we need to stop the nonsense of “light” (reduced fat) foods and focus to the high nutritional value of full fat meat, dairy, fish. The animal fats (lipids) are healthy. Nations who eat red meat and full fat foods have lower levels of obesity and CVD (CardioVascular Diseases) and other NCD (Non-Communicable Diseases) to nations (e.g. US) who eat “light” processed foods.