"Without meat we go hungry. Without fire we die!"

Food Were Paleolithic humans vegetarians?  It's open to debate:

"Paleolithic vegetarianism, the idea that early humans were herbivores, rather than omnivores, has been debated for centuries all over the world. The diet of our early ancestors is a heavily-researched topic that raises several unanswered questions. Researchers have found evidence to support the idea of "subsisting or feeding on animal tissue" while other evidence has been found that indicates that herbivory was the diet of our early ancestors."