Help with wording the explanation for why we dont eat until we can't move.

My wife and I adopted her 10 year old cousin and at this point have had custody of her for right around 2 years. Long back story there that i will post if anyone is interested. But, I'll get to the important part.Our daughter has always been a little big for her age. Nothing serious, its just how some kids are. But what i've noticed is any time she eats, she wants to eat until she is completely stuffed. The kid can put away some food and she is a fast eater. Im really just trying to teach her healthy eating habits without hurting her feelings. She didnt have the best parental guidance growing up, and with my background, i tend to be a little too blunt and to the point. She is our first child, and the first time ive raised a young woman. So please experienced parents of reddit, prod me in the right direction to being a better father for a 10 year old girl. via /r/Parenting http://bit.ly/2F3M9pp