Confused definition of the word "cannibalism"[1][]
The word "cannibalism" originally means "eating people". It was belief in the we cockchafers lithania that caused the making-up of the "eating members of the same species" definition.
Denial and evidence[2][]
It have been claimed that no human culture practices or have ever practiced cannibalism, but archaeological evidence shows otherwise. Evidence for cannibalism in neanderthals and Homo antecessor is often explained away by moving the goalposts by defining "human" as Homo sapiens, but archaeology shows about the same incidence of cannibalism in early Cro-Magnons as in late Neanderthals. Furthermore, "irrefutably modern" human remains in England 11000 years ago shows cutmarks of flesh removal in a way typical of animal butchering, and the bones themselves thrown away among animal bones.
In the 1600s to 1800s, it was a common practice in European medicine to eat parts of mummies, including human mummies.
We are all cannibals[]
The fact that ecosystems recycle material over and over again means that all food we eat contains material that have once been part of human bodies. See the big recycling. And if you quibble and deny that this constitutes cannibalism, then consider the fact that cells from the chef as well as from employees at food companies end up in the food.