1. Dietary fiber: A polysaccharide that can neither be digested and absorbed by the gastrointestinal tract nor produce energy.

2. Prebiotics: A dietary supplement that selectively stimulates the growth and activities of bacteria in one or several colonies and has beneficial effects on the host, thus improving the health of undigested food components in the host.

Second, the role is different.

1, dietary fiber function: promote gastrointestinal peristalsis, accelerate the passage of food through the gastrointestinal tract and reduce absorption, while insoluble fiber absorbs water in the large intestine to soften stool, which can play a role in preventing constipation.

2, prebiotics: increase intestinal peristalsis, reduce constipation, promote the absorption and utilization of calcium, reduce osteoporosis.

Extended data:

Because prebiotics can regulate the stomach and promote digestion and absorption, prebiotics are added to many baby milk powders to make babies better absorb nutrients. Adding prebiotics to milk powder is beneficial to adjust the baby's intestinal flora environment and regulate constipation and diarrhea in both directions. The functional components reach 90%, which fully embodies the advantages of prebiotics and gives full play to the functions of prebiotics.

People in China mainly eat cereals, supplemented by vegetables and fruits, so there is no risk of dietary fiber deficiency. However, with the improvement of living standards, the degree of refinement of food is getting higher and higher, and the proportion of animal food is also greatly increased.

The caloric value of dietary fat in some big cities has increased from 20%-25% decades ago to 40%-45% at present, and the intake of dietary fiber has also decreased significantly. The so-called "life is getting better and better, and there is less and less fiber".

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