[mixmastamyk]

You're right on some level. But given that sugar and starch are packed into all processed food, I think it makes that level of calories difficult to sustain for most people. Note that the blood-sugar-rollercoaster that cheap carbs give makes you ravenous at the trough. An additional factor in why we eat too much of it.

Meanwhile after an example lunch of fish, veggies, and olive oil I feel full and satisfied almost all day (with the same range of calories).