What is fiber? What is the role of fiber in the body?

Effects:
Slow down the aging process: the elderly need to pay attention to eating a lot of vegetables and fruits because fiber stimulates intestinal motility, avoiding constipation. Moreover, vegetables and fruits provide the body with essential nutrients for the elderly, such as vitamins and trace elements: Mg, Zn, Cu, Fe, Se... and antioxidants.
The fiber in vegetables also helps push excess cholesterol out of the stool, helping the body prevent atherosclerosis.

People with obesity and diabetes:
Eating lots of vegetables and fruits increases the feeling of fullness but the meal's energy does not increase, and the amount of vitamins and minerals is still provided sufficiently. Fiber contributes to effective weight loss in obese people and maintains normal blood sugar levels in people with diabetes.

People with high blood pressure and high blood cholesterol: should eat a lot of vegetables and fruits (about 500g/day) to supplement potassium, contributing to lowering blood pressure. On the other hand, people with high blood pressure often have high blood cholesterol, eating a lot of vegetables and fruits helps to remove cholesterol from the intestines, contributing to lowering blood cholesterol.

Soluble fiber is often found in the outer shell of grains, brown rice, germinated brown rice, pectin has the effect of reducing the risk of atherosclerosis through affecting lipid and lipoprotein metabolism and glucose metabolism. Experiments show that supplementing 2 - 10g of soluble fiber/day helps reduce total cholesterol and LDL-C.

In addition, soluble fiber has the effect of reducing glucose and keeping insulin levels stable in healthy people, effectively increasing insulin sensitivity in people with type 2 diabetes and hypercholesterolemia.
The amount of fiber provided from the diet should be around 14g/1000Kcal, of which soluble fiber is from 10 - 25g/day.
Average fruit and vegetable consumption in Vietnam is currently low: green vegetables in meals generally tend to decrease (consumption is about 200g/person).

Source: https://nhandan.vn/chat-xo-la-gi-vai-tro-chat-xo-doi-voi-co-the-post833231.html