Originally Posted by nawchem

No.

I did many fasts lasting as long as 12 days since my teens. Non-fasting days I ate 1400 cal while running track, playing on the tennis team and working active jobs. I lost no weight from it. For me I develop high reverse T3, my body turns down my metabolism.

My best fat loss occurred while working out with a trainer and doing 4 hrs of a day of intense exercise. (I normally do 3hrs and 1hr of it is yoga). My weight didn't change much but bodyfat went from 28% to 20%. My 2nd most muscular phase was 18hr IF but eating up to 300 carbs a day.

It all depends on what the cause of your increased body fat is and
how your body reacts to nutritional changes and exercise.