Exactly. It's like no shit someone's going to be hungry if they try to live on empty calories. Or even just standard food that was lazily made by tossing tons of sugar and oil at it. The presumption there is just absurd. It's basically saying that every single human being up until the weight problem began had been living in continual starvation.  But it's obviously not the case. And all the foods people were happily feeling healthy and sated on back in the day are still around. Hell, even more accessible really. You can get ingredients from all over the world in even fairly modestly sized towns. I mean I've had to adjust my diet because I was getting too full on too little calories. Spiced vegetable soup is hardly any calories and insanely filling. Even going a bit further away from healthy food, the tofu veggie curry I make is near to the point of making me feel like my stomach's going to explode after 500 calories of it.  Hell, I'd be miserable trying to live on my maintenance calories in packaged food. I'd do it, but I wouldn't really love the experience. The answer isn't to be miserable. It's to get off my ass and spend a couple hours in the kitchen once a week. Real food is really really filling!