The meat question. (essay)

Recently, (no comma here; need one for introductory phrase.)researchers discovered a correlation between red meat and some types of cancer. However, the debate about the danger of the meat in general started had begun long before.
Why do (English interrogatives -- how, what, when, where, why -- often require some form of "do"-auxilliary verb.) many people think that meat should be avoided?

Since ancient times, people have eaten meat and animal derivatives which are, in some cases, the only source of protein of their diet. It is quite common that people eat meat every day, sometimes even more than once. This kind of consumptione may bring health problem, especially ifs therew are is a lack of other important food.

Taking this into account, vegetarians people say that renouncing meat is a great step forward to improve our own nutrition alimentation.("alimentation" may be a false friend -- it's about delivery of food.  anyway, not part of most people's working vocabulary) Searching for protein in vegetables or animal derivatives should increase our daily consumptione of vitamins and fiber.

In my opinion it is not necessary to eliminate meat completely. Nevertheless, being vegetarian is certain to bring a large number of benefits. Therefore, People who can not stop consuming meat should at least reduce it.

Nicely written, easy to understand with only some minor mechanical issues, for which I've suggested corrections.