When it comes to carbohydrates, you have two main groups: simple and complex. Simple carbs can be found naturally in fruits and milk products, but also in processed foods like sodas and desserts.  Complex carbs are found in foods like pasta, bread, rice, and potatoes. They are actually made up of many simple carbs linked together to form chains. Those chains have to be broken down by enzymes before they can be absorbed.  Carb blockers contain substances that inhibit some of the enzymes that break down those complex carbs, allowing them to pass through the large intestine without being broken down or absorbed. Meaning they don’t contribute any calories or raise blood sugar.  Additionally, carb blockers have been found to affect the hormones involved with hunger (ghrelin) and fullness. They also may help slow stomach emptying after a meal.