rustymoose54 said:yeah, it's like how every chemist has their own little theory on the relative molecular mass of a carbon atom, what the chemical formula for pure aspirin actually is, whether insulin is a hormone or an enzyme 😁—basically, what pH even means, if eating fructose spikes your blood sugar, stuff like that...
forgot to mention: every wannabe scientist
You've mixed up two different threads here, but I'll answer you anyway.
See, when I was a kid (which wasn't actually that long ago), there was this specific children's aspirin. Pretty sure it was similar to something like Advil, just with some additives to make it "easier" on the stomach. Nowadays, neither pregnant women nor kids are supposed to take aspirin for various reasons (not that I want to start a whole new debate). Or back then, people used to give babies eggs and lemon when they were just a few months old. Now, they say don't even give them egg whites until they're 12 months. Etc., etc.
Or, taking something unrelated to kids. Microwaves were huge when they first came out, and now there are all these theories about how they're super unhealthy and that you shouldn't cook anything in them for kids under three.
That's just how I see nutritionism. I wouldn't even link it to hard sciences, though looking back, those have evolved too in certain fields. If I had to connect it to anything, it would be medicine and ways to treat diseases like cancer or Hepatitis C. Some people follow the exact same protocols and beat cancer, while others don't make it. Milk might be fine for one person but terrible for someone else...