I have found the gut bacteria studies to be very interesting and their role in driving hunger. It seems to make sense. Antibiotics are given routinely to farm animals and it seems nearly all children are given antibiotics at sometime during their childhood.
Sounds like there could be a dieters’ probiotic.
A lot of it too is their eating foods that make them both hungry and fat. It may be gut bacteria, such as candida, as well as ignorance due to government misinformation campaigns, causing them to do so.