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Not that surprising tbh, Satiation isn't directly dependent on calories consumed but on various markers such as chewing, pressure on stomach wall and certain chemical responses.

Junkfood short circuits most of these, it's incredibly calorie dense and is easy to eat quickly since it requires little chewing, by the time your body signals satiation you can easily consume 1300 calories or more.

I've been on a calories restriced diet for the last 4 months (1500 or less a day) and I've eaten a few times at McDonalds, I just get a quarter pounder (higher meat to carb ratio, meat increases satiety more than carbs per gram) and a diet coke and then eat is in small bites and chew it thoroughly, by the time I'm done I feel the same satiation as I would have done bolting down a big mac and fries previously.

So far I'm down 45lbs with another 10 or so to go.

Assuming the full meal was a burger, there's basically no fiber. "Healthy food" tends to mean something including a bunch of vegetables, which are full of fiber

It's because of all the 'empty calories'.