I am dying to know how it was possible.
Do you have a reference to nutritionist or perhaps a meal plan? Where can I learn more about such things?
https://idealprotein.com/science/
https://idealprotein.com/healthcare-providers/
The website addresses some of the myths including of calorie in/out because not all calories are equal and also every type of food can lead to weight gain.
My own experience is that I eat much more and don’t go hungry. I eat every 4 hours.
Btw ketogenic is not equal to keto diet. Sometimes people confuse the terms. Most of my fat comes from two spoons of olive oil I eat daily.