Isomalto-oligosaccharides (IMO) is the notorious synthetic fiber invented by QUEST Nutrition. It was purportedly not capable of being digested by the human gut, and was used to falsely reduce the net carb count on the labels of Quest Bars. The fiber became notorious when QUEST Nutrition was sued after it was found that IMOs are in fact partially absorbed. IMOs have a glycemic index of 35, which is comparable to Malitol, one of the least preferred sugar alcohols. Many low-carb protein bars are still using Isomalto-oligosaccharides. What this means for you if you’re on the keto diet is that you should avoid them. But if you must, you should take about 50% of the listed grams of fiber and add them back in as carbohydrates to your net carb count. Failing to count the carbs in these bars could really throw off your macros, especially if you’re busy and eating one every day, which can happen. Always scrutinize the labels!