[mixmastamyk]

I think your larger point is right re: sheer calories.

But, there's a significant difference in what people want to do or think they do), and what they actually do.

The fact that sugars and starches spike blood sugar, which later falls rapidly causing hunger pangs, makes it very difficult to stay on plan. These people feel like they're starving.

Alternatively, a person eating fish and veggies soaked in olive oil never experiences the spike, burns fat slowly, and can stay hunger-free for most of the day. I.e., what may be a higher calorie meal in the short-term, allows one to take in fewer calories over the course of the full day... since there is little desire to snack.