|>>|| No. 4743
Get some scales. Healthy BMI was 20-25, but lower bound was taken down to 18. Sorry to say, but it's highly unlikely you have some hormonal leptin secretion defect that's influencing your weight. The answer is the same as it's ever been; and it's as horrible as it ever was -- eat less, exercise more.
There's a proven link between increased stress and weight gain, and a link between <N hours of sleep and increased stress. Aside from the other bad side effects, this is one way in which caffeinated beverages might hurt somebody on a diet even though they're 0-calorie. They're also diuretics, which I think is bad for appetite regulation.
Check out -- https://www.cam.ac.uk/research/news/being-overweight-linked-to-poorer-memory
That's another mechanism to link lack of sleep and overeating. Dr. Cheke's other research is interesting. The strength of your memory of how recently you eat, will influence when you eat next. If you eat with distractions (eg. using your phone, in front of the TV), you remember the episode less well, and eat your next meal sooner. She's investigating a hypothesis of a causal link between age-related memory impairment, and weight gain in middle age -- people gain weight in middle age; middle age is when memory begins to decline. Lots of interesting research, lots of academics and medics with lots of explanations as to why everybody's fat now. But there's a consensus on the solution, which is, "eat less, exercise more".