Apparently one major issue with fast food is the hyperpalatability.

For example, when I visited my family in the states, I ate two double cheeseburgers at a fast food joint at 1000+ calories per burger, and I figured I could probably eat two more in that sitting without issue.

In other words I ate 2000+ calories in a few minutes and could have kept going. Even one burger has more calories than I eat in a single meal.

Meanwhile, I couldn’t eat 15 medium sweet potatoes (1000 calories) in one sitting.