I've lost weight through forcing myself into a calorie deficit, and it works really well, but it's not particularly fun.
Sure but food doesn't have to equate to consume large quantities of junk food for it to be pleasurable.
We can learn to have a healthy meal with a reasonable portion that is as satisfying.
For the "eat to get slimmer" claim, I think we're at the point where "extraordinary claims require extraordinary proof."
What do you mean by "these foods"? Just buy unprocessed food and 99% of the problems disappear. There is no fake, no people trying to sell you these out of malicious intent. Just buy local food people had access to in 1900 and you'll cure all your problems.