By that logic, you can eat 1000 calories at once or 500 calories meal. Which is false.

I also disagree with the 10x rule because it's too general. If a 150lb person sits on their ass all day long, getting up once or twice to go to the bathroom and that's it... maybe they broke a leg or something...whatever. There is no way they will use up 1500 calories as *energy* And 300lb fat people don't need 3,000 calories.