While it's only n=1, well actually n=2, my two sons are truly thin at 17 and 18. Because I learned about DANDR and was determined that my kids didnot follow in my obesity steps.

They eat high quality foods. We won't use the mac n cheese from the food pantry. Far better to eat meat, veg, fruits and fats.Better to skip a meal than fill up on mac n cheese.

My boys can eat a scary amount of food, like a dinner plate piled with mashed potatoes and butter.......then skip a meal. Or half a skillet piled high with steak and veg like a stir fry then eat half for dinner, other half for brunch next day.

Yes, quality far out weighs quantities of high grain carbs called bread, donuts and breakfast cereal.

(And I tell my kids what is wrong with the pyramid and the plate! In the US.)