Every time I see this cow picture, I'm always reminded of Pink Floyd.

you should show your scientific sources for that claim

when not eating meat has been scientifically proven to reduce your health due to protein starvation...

You misunderstood the science. Not getting a sufficient intake of nutrients, including proteins, is what's killing you. You can easily get proteins from plants and plant based foods. Then everything is fine.

but we do have to because we evolved to require it over 12k years ago and nature is cruel like that [...] consuming flesh is inevitable

No. We didn't and we don't. If I am not mistaken, in humanities history we mainly had a plant based diet. The massive increase in meat consumption is a rather modern phenomenon.

We are omnivores, yes. That means we have a digestive system which is able to process meat as well as plants. But that doesn't mean we have to use both or a single source. It is possible to get all of your required nutrients from plants and plant based sources.

12k years ago we learned to farm crops.

We have been eating meat way longer before that (I believe ~400k years?) but only because we were able to use fire to make it consumable for us (cooking also expanded the availability of plant proteins at the same amount). We aren't really capable of consuming raw meat very effectively until this day. Especially when looking at our digestive system, we're still very close to the fruit, nut and bug eating apes.

That's not evolution.

not eating meat has been scientifically proven to reduce your health due to protein starvation

Citation needed

It is the position of the American Dietetic Association that appropriately planned vegetarian diets, including total vegetarian or vegan diets, are healthful, nutritionally adequate, and may provide health benefits in the prevention and treatment of certain diseases. Well-planned vegetarian diets are appropriate for individuals during all stages of the life cycle, including pregnancy, lactation, infancy, childhood, and adolescence, and for athletes.

https://pubmed.ncbi.nlm.nih.gov/19562864/