ISSA Nutritionist Practice Exam 2026 - Complete Preparation Guide

Soluble fiber is known for its ability to help regulate blood glucose levels. This type of fiber dissolves in water to form a gel-like substance in the digestive tract, which can slow digestion and the absorption of sugars. As a result, it helps to prevent rapid spikes in blood sugar after meals, making it particularly beneficial for individuals managing diabetes or those looking to maintain steady energy levels. Foods high in soluble fiber include oats, beans, lentils, fruits, and some vegetables.

In contrast, insoluble fiber primarily aids in digestive health by adding bulk to the stool and helping to move it through the intestines. Sugar alcohols, while they can be lower in calories and have a lesser effect on blood sugar than regular sugars, are not classified as dietary fiber and do not function in the same way as soluble fiber. Starch, another form of carbohydrate, can spike blood glucose levels if consumed in large amounts and does not possess the same regulatory properties as soluble fiber.