Food chemistry is one of the most complicated chemistries ever. Not only we can't simply construct an argument of safety from first principles but also nutrition labels hardly makes an exhaustive list of the contents and processes involved. Not even mentioning the labeling regulation quirks.
> All food is processed.
This is reduction to absurdity. Even if genetically engineered, the process of cell divisions that end up being a living cow is so complicated that it would lend itself more readily to a claim of integrity, one much stronger than a decade old factory assembly process of dead nutrients. We've co-evolved with the former process for millions of years and created the latter in the last several decades in the name of profit maximization.
That's not what processed food means. A slice of steak from a GMO cow is not processed food, except inasmuch as slashing a knife is a process.
Furthermore, more or less traditional cheese is not considered "processed food" in that context even though it is definitely processed for a long time and with significant effort. Nor is wine or sauerkraut for that matter.
> In 2013, Ramsden resurrected another long-lost randomized study, the 1960s-era Sydney Diet Heart Study. Reanalyzing its unpublished data—also stored on old nine-track computer tapes—he found that volunteers who replaced much of the saturated fat in their diet with polyunsaturated fats high in linoleic acid had a higher risk of death from coronary heart disease
Food has extremely strong cultural significance and a lot of people tie up their identity with it. I can understand that. If they feel that their diet is under attack they see it as life and death for their identity.
I imagine you've picked a side and will seek whatever information or studies suits you; everyone is doing that these days. It's anti-scientific.
Oh and australopithecus ate meat, this goes far beyond modern humans. This is why we got smart, because intelligence pays off far more for hunting than for foraging, particularly for an otherwise frail creature.
In terms of the last thing you said. You phrased it as "australopithecus ate meat"; it seems they predominantly were herbivorous according to wikipedia[2]. Which doesn't preclude eating meat, but could easily be misinterpreted from the way you put it.
[1] https://livinontheveg.com/wp-content/uploads/2017/02/compara... [2] https://en.wikipedia.org/wiki/Australopithecus#Diet
I didn't mean to imply that australopitecus was predominantly carnivorous, but I recently found out they had tools for hunting and/or cutting flesh, just to make a point that the trend started much earlier than homo sapiens.
Might come back with more links/thoughts later