If you stuff yourself regularly - really stuff yourself past the point of feeling full, almost to the point of pain - and do that regularly over a period of time, you will find your stomach capacity will grow. You will stretch out your stomach.
At this point, my capacity is such that I become hungry very easily, stimulants aren't necessary.
I would caution anyone at consuming any kind of drug or chemical if you don't have a good understanding of the long term effects of it.
My feeder has, year ago, made some herbal appetite stimulants (teas and things), which at the time I may have thought were working, but very well could have been just the suggestion (psychosomatic)? But stretching out your stomach really does work.
7 years