"I only eat 1000 calories" My mom is a lady with a very slim and petite figure, but her younger sister is small and obese like a beachball.  I hear my aunt constantly complaining to my mom about how she seems to have some sort of illness because she only eats 1000kcal and can't lose any weight. When we eat together my aunt eats a bit less than us and tells us she doesn't eat more than any of her slim family member.   So we legit believed she had some sort of medical condition (my aunt is the only overweight family member we have, but she was adopted). TURNS OUT she has been snacking healthy stuff between the meals. What she meant by it was she ate 1kg (2lbs) of grapes, an entire can of nuts in one sitting and always ate at home before coming to eat with the family.    1000 calories were maybe the nuts alone.