>People ate more, but that wasnt the fault of the meals.

I don't really know what you mean by "fault" here.

They established that one of the causal factors of how much someone ate was whether the food was ultra-processed or not.

So I would say it is partially the fault of the meals.

There is a reason why pretty much every health organisation and expert in the field say's to limit consumption of ultra processed foods.

>You should limit highly processed foods and drinks because they are not a part of a healthy eating pattern.
>
>https://food-guide.canada.ca/en/healthy-eating-recommendations/limit-highly-processed-foods/