He has clients that he gets doing everything right and they still aren't losing weight.

What you say makes total sense to me but then when I have people in my life who say all 4 of their kids have pretty much the exact same diet and only one of them is naturally much larger than the others and very overweight, I don't know what to do with that information.

My buddy from college Christmas cards every year are wild. Two In-Shape parents, 3 in shape kids, and then one that literally looks 280 lbs. And he swears she doesn't have different eating habits. He has such a hard time with it. I'm not going to say you're wrong dude, she's eating behind your back. I just show empathy. I'm tempted to find a Facebook link but that obviously that would be wrong to do.