[bumby]

>The problem is that the body will compensate for the lower calorie intake.

For the most part, this is a myth, just like the idea that one's metabolism slows as you age.

What can happen is your behavior modifies. E.g., if you eat more, you unconsciously fidget more and burn more calories.

Most people (even dietitians) are not good at gauging their calorie intake. Unless you are weighing all your portions, it's more likely that measuring error is the culprit, not that you can double your calories consistently and not gain weight.