I want to get into the Shadowrun setting, but I don't care a lick about the rules.

I'd run it FKR style. Where's a good place to get a crash course in the setting?

Why would early humans have a mostly meat diet? There's plenty of foragable herbs, vegetables, and fruits to eat. Go to anywhere near the equator. Bananas grow on the trees.

We also have archeological evidence that producing beer happened before agriculture. So us humans were clearly pretty experimental with food.

Ancient humans probably ate a great diversity of plant life than we did!

Classic sword and sorcery is required reading for aspiring GMs.