If you have assumed that gnat’s favorite food is blood because they bite and suck blood from humans or pets, then we politely point out that you are wrong.
First, you need to understand that not all gnats species bite, and secondly, the biting species feed on blood only for breeding purposes, i.e., to lay eggs.
If you are curious to learn about gnats’ diet, how much they eat, and whether their diet impacts other species, continue scrolling.