I'm sure an obese person claiming to eat 1000kcal per day can still gain weight but that is largely due to selfreported calorie estimates being a bad measure. Put that person in a chamber where calorie intake is controlled and I'd bet the effect disappears.
Yeah, I don't know if it was that episode or from somewhere else, but there was a similar thing where they followed the person around for a day and it turned out they didn't count anything ate as a snack between meals. They were accurately counting their meals, but including the snacks went somewhere above 3000 a day.
Ate only 1000kcal in food. Added in 1400kcal in sugary drinks and 2000kcal in small bites of this and that (that don't need to be counted, because it's just one spoonful of peanut butter!)
