Gas and weight

Considering that warm air rises, if a man builds up gas and the ambient temperature is less than his body temperature, does he weigh less than when he does not have gas? If he ate a pound of beans, would he weigh more or less? Going further, if one ate...

enough gaseous food, would they ultimately float off into space?

I imagine that it would take an amount of gas larger than our body like maybe 5 times as big, or more. think of a hot air balloon, or a blimp/zepplin, it takes a lot just for a relatively small quantity of people. The amount your body can realisticly contain probably is not even enough to make you weigh less. but that would be flippin rad if you could!

Oooohh I hope they would...shoooweee!!!

probably not.