Which type of fiber helps lower cholesterol and stabilize blood sugar levels?

Soluble fiber is the type of fiber that plays a significant role in lowering cholesterol levels and stabilizing blood sugar levels. It dissolves in water to form a gel-like substance, which can help to bind cholesterol in the digestive system and prevent its absorption into the bloodstream. This process can ultimately lead to lower levels of LDL (bad) cholesterol. Soluble fiber also slows down the digestion and absorption of carbohydrates, which helps to maintain steady blood sugar levels by preventing rapid spikes after meals. Sources of soluble fiber include oats, beans, lentils, fruits like apples and oranges, and some vegetables.

In contrast, insoluble fiber does not dissolve in water and primarily aids in promoting regular bowel movements and preventing constipation, but it does not have the same cholesterol-lowering or blood sugar-stabilizing effects as soluble fiber. The terms digestive fiber and metabolic fiber are not standard classifications within nutritional science and do not refer to specific types of fiber that would have the properties emphasized in the question. Thus, soluble fiber is the correct answer due to its specific beneficial effects on cholesterol and blood sugar.