I always lose a couple of stone during extended stays in the Phils.
The heat I suppose, plus I actually take more exercise there.
The calories from gallons of San Mig seem to have no effect at all...other than on my ability to walk home.
I also seem to lose plenty of kg in Pinas.
I would agree that the heat must be a factor. Plenty extra exercise for me also.
Plus I tend to eat less overall.
Tend to drink more though