It is advisable to avoid foods containing large amounts of these sugars for a while to see if they might be causing your problems. If you have already eaten the maximum daily amount of lactose, it is not surprising that you suddenly feel ill when you have eaten the same berries as the day before, without any ill effects. Evidence has been found that the cause of many of these symptoms may actually be certain sugars: fermentable oligo-di-monosaccharides and polyols, which gave rise to the term FODMAP. Scientists Peter Gibson and Susan Shepherd of Moash University in Australia examined the causes of the vicious cycle of flatulence, diarrhea, constipation and malaise. Fermentable: These sugars have the ability and tendency to ferment in our intestines, leading to bloating and diarrhea. Some people continue to suffer from unpleasant digestive problems despite giving up foods they cannot tolerate. This guide can be used to test which fruits are better tolerated after a period of abstinence. Studies have shown that there is a certain maximum daily amount of FODMAP that can be tolerated. A pure paleo diet excludes the consumption of fructose and galactans, avoiding grains. Try to determine your FODMAP limit and apply it to every meal of the day. You cannot completely avoid each of these sugars because they are naturally present in the foods we eat. If you exceed your limit, a negative reaction is likely. Double sugars: sucrose, maltose, lactose.