你的肠道细菌在喊饿（完形填空）

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你的肠道细菌在喊饿（完形填空）

容易

难度

说明文

时文类型

健康与饮食

时文话题

高中二年级

适合年级

奇速优课

时文摘要

你每天吃的食物里有种看不见的东西——膳食纤维。它虽然不能被人体消化，却养活了肠道里万亿细菌，帮你防病、通便。大部分人吃不够，你呢？

时文录音

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闯关习题描述一下时文录音

Most adults do not get enough fiber in their daily diet. Only 5% of adults meet the recommended daily ___1___ — 25 grams for women under 50 and 38 grams for men. The average person eats only about 17 grams per day.

Fiber is not ___2___ by our bodies directly. Our stomach and small intestine (肠) absorb most nutrients from food, but they ___3___ the enzymes (酶) needed to break down fiber. Instead, fiber passes through to the large intestine, where billions of ___4___ live. These bacteria have genes that allow them to digest fiber, turning it into ___5___ that lower inflammation and help ___6___ us from diseases like type 2 diabetes, heart disease, and certain cancers. Without enough fiber, these bacteria cannot function ___7___, leading to ___8___ and other health issues.

Experts recommend increasing fiber ___9___ gradually rather than all at once. Small changes can make a big difference. For example, ___10___ from white bread to whole wheat bread, adding berries to breakfast cereal, or snacking on nuts instead of processed foods can help ___11___ fiber consumption. Drinking plenty of water along with high-fiber foods is also important, as fiber needs water to work ___12___.

The best sources of fiber are ___13___ plant foods rather than supplements. In whole foods, fiber works together with other nutrients to support digestion, ___14___ supplements often contain only ___15___ fiber types that may not provide the same benefits. While it is possible to take fiber supplements, experts agree that getting fiber from natural food sources is the healthier choice.

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