In my own experience, the more nutritious the food, the less you need to eat anyway.
The body has its own way of letting you know when it is satisfied. Junk food does not satisfy nutritional needs and therefore keeps the body in a state of hunger: hence the reason people eat more and become obese.
In the time of Ghenghis Khan and Alfred The Great people lived on ONE a meal a day & this satisfied hunger and the bodies need for nutrition.
I have also lived on one extremely healthy and organically nutritious meal a day (admittedly with small healthy snacks like fruit in between)and normalised my weight from being underweight.
It is not the quantity but the quality that really matters.
A low calorie diet is also anti-aging so people look younger as they grow older too.