In parsha Noach, G-d ALLOWS man to eat meat but there is no literal commandment to do so. Later, when the Mishkan and then ultimately the Beis Hamikdash are built, there are commandments for the Kohens to consume parts of the korban.
In addition, Devarim 12:20 says — "When the Lord, your G-d, expands your boundary, as He has spoken to you, and you say, "I will eat meat," because your soul desires to eat meat, you may eat meat, according to every desire of your soul."
So it seems G-d is ok with man eating meat within the restrictions of kashrut if man so desires and the Kohanim are expected to consume it. But in these times, scientists and nutritionists are telling us that eating meat, red meat in particular, is not healthy.
So the question: Why does Hashem sanction the eating of meat if it's generally unhealthy for us?