Can you give more context to what he says? Is that 15 cal/body weight for maintaining your current weight, or to gain/lose? I'm betting it's to maintain your current weight. So if you're trying to lose, you would eat somewhere less than that. What about your LBM? Wouldn't that factor into it? Seems a pretty broad statement.

According to that, at 135 lbs, I would eat 2,025 cals and maintain that weight. To lose weight, I need to eat less than that. That would be correct for me, especially if I'm pretty sedentary, and for my height and proportions. Although I personally need to target below 1800 to lose, which is probably due to the fact that I'm too lazy to measure things and I just pick things in MFP that are close to what I ate. So I figure sometimes my estimates are lower (or higher) than reality. In general, people usually underestimate their caloric intake, so I personally take the approach to aim a little lower and assume I'm a little higher in reality.

So then according to his guideline, when I'm down to 125, I can eat 1,875. That also seems relatively accurate, although probably at the high end of my cal range to maintain that weight. And that's without crazy exercise.

So... probably this makes sense, but I'd be interested in the full story. And of course, that's 15 cals/body weight of nutrient-dense foods, right? Not waffles.