it's people eating too much making people fat

Which is much easier to do when 90% of the products at grocery stores are extremely calorie dense with ingredients that are not exactly good for you in high amounts. And you don't realize it because they don't want you to.

Back to what u/dahdly said:

it is quite easy to eat a day's worth of calories in five minutes in america

So you buy what you think are "light snacks" only for them to be packed and packed and packed with sugar. You eat 3x your recommended daily sugar intake in one sitting but you think you're healthy because the box says "made with real strawberries" and the advert shows beautiful people with healthy bodies and straight teeth guzzling it down on a sunny morning. And this goes for majority of processed foods. There's sugar in everything. You overeat and you don't know it.

If you eat clean, you won't have to worry about "eating too much". How many apples would it take to make you obese? You'd be uncomfortably full before you get anywhere close to gaining an a iota of fat. When you eat clean, you just eat until you're satisfied and you know that what you've put into your body is only what it needs to work efficiently.

It's like the weed vs drugs analogy, where any stoner will tell you that you "can't overdose on weed" and "no-one has ever died from weed, it's perfectly safe". Well, you can overdose on weed. But you'd have to smoke a lot. I mean an absolute comical amount. I literally mean a smoker would theoretically have to consume nearly 1,500 pounds of marijuana within about fifteen minutes to induce a lethal response.

Whereas a drug like heroin is much easier to overdose on because it is highly concentrated. The difference between a life and death dosage can be milliliters.

So back to food. The grocery stores are offering you mostly processed junk, the "heroin" of food. But it's presented to us as "weed". And so we eat and eat thinking we're okay, and 200kg's later we have no idea what to do with ourselves.

But your point stands. We are eating too much. I wish more people understood that all it comes down to is calories. Because sure, you can eat processed junk and still be in shape, but I think you'll agree that that would take a painful amount of calorie counting. For me personally, I'd rather eat good amounts of clean food, than little amounts of bad food.