OK, we are having an argument at work about this. Lets say that your colon is full of gas. Do you weigh more before it gets out or after? Here are some ideas: - You weigh the same. Its basically air. - You get heavier. The gas is lighter than air so it does provide a small amount of lifting. Mabey milligrams but its there. - You get lighter. The gas is full of poop particles that get carried out with the gas reducing weight. This assumes a no underwear condition as that would catch any poop particles and keep the weight. Thoughts or ideas?