Venus fly traps can benefit from being fed regularly. While feeding is not required, Venus fly traps will grow more quickly and have overall better general health if they are allowed to catch insects or fed on a regular basis. If you are growing your flytrap indoors or in a location without many insects, you may choose to feed your Venus flytrap to help it grow more quickly and be healthier.
DO NOT feed your Venus Fly Trap anything other than insects. Under no circumstances should a Venus Fly Trap be fed something that it couldn't catch on its own in nature. First of all, this will likely make the trap turn black and die if it actually forms a seal around the meat and starts to digest it. Continually feeding a Venus Fly Trap stuff like chicken, beef or pork could actually end up killing the plant.
Secondly, it is unlikely that the trap will even seal completely to begin the digestion process because it requires live prey on the inside of the trap struggling to signal the trap to seal.
The only things you should feed your Venus fly traps are insects. Any kind of insect is fine. Flies, beetles, spiders, wasps, earwigs and pretty much anything that crawls or flies and is an insect is good.
The reality is that you don't actually need to feed your Venus Fly Trap anything other than lots of sunlight. If you grow it outside, it will catch all the food it needs on its own and get plenty of sun.