If you put in hot water, it sets of certain kind of enzymes, which behave in a certain way in the honey, which tend to take away weight from the body.
If you put in cold water or cold drink, it behaves in a different way in which it accordingly it adds weight to your body
It is not that a few spoons of honey you are taking is adding or losing weight to your body it is just that it sets off a certain reaction in your system that your absorption rate is such that you tend to gain or lose weight.