Posted 07 March 2009 - 09:35 AM
It is common to fart at times when the colon is active like in the morning and after meals. The colon is more likely to push the gas all human beings have to the end.Sometimes IBS causes problems with handling normal volumes of gas (so you might not be able to hold it, etc).Gas volume and odor is a combination of what food you eat and which of the normal bacteria all healthy humans have in the colon, or which ones are dominating the ecosystem.Sulfur reducing bacteria`make the smelly gases from sulfur found in all protein foods and some plants like onions.It doesn't take very much hydrogen sulfide to make a big smell so usually volume isn't so much from these gases.Most of the volume is from carbohydrates. There are some no human digests so they feed the bacteria like raffinose in bean or resistant starch in wheat. Some things like lactose and fructose can be a problem for people that don't break down lactose or absorb fructose.How much gas volume you get from carbs has to do with how many probiotic vs non-probiotic bacteria you have in the colon. Probiotic bacteria by definition do not completely digest carbs so stop before breaking them down to gases. Most other bacteria will break it all the way down to various gases (hydrogen, methane, carbon dioxide).You can have a very high gas volume and not have IBS, and you can have IBS symptoms with very normal or even sub-normal gas volumes. IBSers generally have a lot more problems with the same volume of gas that would not bother anyone else.For volume issues try limiting carbs or see if probiotics help.For smell try limiting protein to 3 ounces per meal (most people eat a lot more than that in a meal) and if it doesn't constipated you too much try some pepto bismol as it absorbs sulfurous gases in the GI tract. Activated charcoal will do that when it is dry, but it doesn't when it is wet like it is in the colon.