[bluecalm]

It's not true. Even if they start with very different calorie needs for the same lifestyle that will even out once their weight changes. The more you weigh the more calories you need and the less you weigh the less you need. That's where the myth of metabolism slowing down after weight loss comes from btw: you just need less calories after some time of dieting so your progress will slow down or steak stall if you don't adjust.