Only buy things with one ingredient. There, now you’re not eating the science experiment.
As a side observation and not particularly referring to your reply, I see that people tend to put food or nutrition if you want, almost in the same scope of politics and religion, many people I know who I consider very open-minded will get very on the defensive whenever I tell them that the best thing to do is to reduce the intake of proteins of animal origin and increase plant consumption. That goes to show that years of propaganda have worked very well.
I'd argue that the main part of the confusion here is that people don't seem to agree on what "food" means, and I'll personally admit that I don't have any confidence in my ability to define it in a clear way that would satisfy most people here. I don't have any particular strong feelings against what you're saying about animal proteins and plant consumption (despite knowing that I fall far short of what anyone on either side of that argument would consider a healthy diet), but that's because it's at least clear to me what you're arguing. The issue to me is that saying something edible is "food" or "not food" implies a binary that's really hard for me to wrap my head around, and it really doesn't seem like anyone is willing to define that in a way that I can understand; as soon as I try to ask questions to understand, it feels to me like the people using this stricter definition of "food" are the ones who get defensive. I want to keep an open mind, since I'm well aware of my lack of knowledge when it comes to nutrition, but it's hard not to feel confused when someone argues that there's a strict boundary where processing something makes it no longer food, but no one seems to be willing to elaborate on what it is. From my perspective, it seems like some people might have a more nuanced understanding of what they consider food, but because it's inconsistent with the previous idea I had of what "food" is, I don't have any way of understanding what their understanding is. If there are people treating nutrition the same way as politics and religion, it's the ones who make bold claims without further explanation and reject any disagreement as the result of illogical forces.
It’s actually trivially simple to define what is food, and what you should be eating. Every vegetable and fruit on the planet. Grains, rice, nuts. Chicken , meat, seafood, etc Put simply: it grows.
This is what all mammals have been eating for hundreds of thousands of years. We know it works. They have one ingredient. They have existed for at least as long as humans.
Then it is trivially simple to define what is not good, and no mammal should ever consume. (But realistically we will just minimize as much as possible). Coke. Fairy floss. MSG. HFCS. These things were grown in a lab. They have very minimal nutrition value, and often a host of negatives. They have only been concocted in the last century, and a massive number of severe health problems have come along with them. These things have many ingredients. They did not exist 100 years ago.
Then there is an enormous grey zone in the middle that people will argue about till the end of time.
It’s not worth your time. Just eat what is clearly food and pretend the rest doesn’t exist. The fact twizzlers and KFC exist have no impact on my life, and I am much healthier for it.
Similarly, We have now invented new lab concoctions that companies want to call “food” because it helps them make money, but it is a very, very different thing than what “food” meant 200 years ago.
Go to an uncontacted tribe and give them fizzy black liquid. No way in hell they’ll drink it, because that ain’t food, and it wasn’t for a few hundred thousand years.
Just because you cannot see a clearly defined boundary does not mean it is not there. A corn cob is food, a processed piece of corn mixed with <insert flavoursome/colourful/preserving chemical> sealed in a plastic bag with a six month shelf life is not