Why would a person who had had a "Cesarean Birth" choose to eat more? This raises more questions than it answers.
I wonder if manually exposing the child to the mother's flora would be of any benefit.
As an aside, my son was born 12 lb 1 oz, he now weighs 31 lbs at 5 months. The same weight as my 3 1/2 year old daughter.
That's approximately 100% efficiency converting dietary calories into body mass, or massive water retention.
You could cure starvation across the world if you good identify the source of that.
The described relation isn't between Cesarean Birth and choosing to eat more.