The diet only limits carbs that are "Fermentable Oligo-, Di-, Monosaccharides and Polyols." No wonder they came up with an acronym!
For most people, FODMAPs are not a problem unless you eat too much of them. But some people are sensitive to them.
FODMAPs draw water into your digestive tract, which could make you bloated. If you eat too much of them, they can hang around in your gut and ferment.
These types of carbs are FODMAPs:
Fructose: Fruits, honey, high fructose corn syrup, agave
Fructans: Wheat, onions, garlic
Galactans: Legumes, such as beans, lentils, soybeans
Polyols: Sugar alcohols and fruits that have pits or seeds, such as apples, avocados, cherries, figs, peaches, or plums
Avoiding FODMAPs doesn’t help everyone. But in a study published in the journal Gastroenterology, about three out of four people with IBS had their symptoms ease right away after starting a low FODMAP diet and felt the most relief after 7 days or more on the plan.
Remember, FODMAPs aren't bad. Many foods that are rich in them encourage the growth of good bacteria in the gut.
Trying a Low-FODMAP Diet
If you have gas, bloating, abdominal pain, diarrhea, or constipation, you might consider nixing all five forms of FODMAP carbs (lactose, fructose, fructans, sugar alcohols, and galactans) for up to 4 weeks to see if it helps. If FODMAPs are the culprit, you’ll probably begin to feel better quickly.
You'll have many foods you can eat on this diet, but there's a steep learning curve about which foods are high in FODMAPs and what foods you could choose instead.