That's the problem with the definition of "healthy". No single food is "healthy" on it's own. It's a wrong way to look at it and why most people fail at finding a good diet. There's no super food you can just eat unlimited amounts of.

A diet can be healthy if it's the nutrient combination of different foods that result in certain number of calories, protein, fat, carbs, minerals and vitamins per unit of time.

Wasn't there just a study, that many fat kids are fat because of fruit juices?

Healthy in a way, but surprisingly a lot of sugar ( either added or from the fruits)

I think there's a bit of a caveat there, because that basically means eating reasonably high calorie food in sufficient quantities that starts violating the "healthy food" definition.

You'd have to eat a lot of broccoli

true but you'll struggle getting tons of calories out of whole foods. This is why mass gainers are popular, underweight people find it hard to gain weight so they dirty bulking using fast food which is often calorie dense.

Eating healthy food alone isn't solution, you need to make your life active as well.

People are different. Weird, right?

I have a friend who was literally ordered, by a doctor, to eat as much fat as they could because they were too skinny. They're the type of person for whom food is 100% fuel and they can just stop mid-burger and not eat the second half because "they don't feel like it".

I'm not like that. Leaving half a burger that I paid for on the plate is something I've never done or even considered a possibility that any sane person would do.

WOW good for you! Man if everyone would just be like you. That would mean no one would need something like GLPs eh?

The latest fad promoted by companies to sell you something?

Does food noise exist in active tribal people (if so why they have less proportion of obese people?) or is it something which happens to sedentary people?

Yes. I'm saying that it goes away when you fix your diet.

Do you know what nutrients are? Deficiencies are the cause of the noise. This is an evolutionary feature, not a bug. Your body is expecting you to keep eating alternatives until you eventually stumble onto the foods that make you feel better and then keep eating those. In severe cases you might need more patience with the right foods, but if you already feel like crap and you know you just started barely eating healthier, why stop now?

This search process has been somewhat disrupted by our modern environment, but it's not like the good food isn't right there. On the other hand, you don't need trial and error anymore. There's plenty of information available. You can even go see a doctor and get a blood test to confirm both your deficiencies and everything else I just said.

Does that answer your question?

EDIT: to reply to replies below and I am "posting too fast"...

TLDR: Y'all need to see a doctor.

I used to weigh 400 lbs, had a bad enough drinking problem to cause numbness in my legs (B12 deficiency to boot), and a sky high A1C. I recovered 100% after a decade of this self abuse. Doctor didn't bat an eye back then nor when I recovered a couple of years later. They see it all the time and my "success" story is very common. Most of us understandably find this all too embarrassing to shout about online. We'd get drowned out by influencers trying to sell you crap anyway.

Also, sorry not trying to be callous, but long term deficiencies can cause permanent damage. If you're still experiencing "food noise" after a serious attempt at a planned diet (and magically never had any other symptoms warning you of the impending damage) I have some doubts, but that's a whole different topic.