Fiber is the thread-like part of plants that your body can’t fully digest but that helps your digestion stay healthy. It can also mean any thin strand of material, like in cloth or cables.
It comes from Latin “fibra,” meaning “fiber,” “thread,” or “filament,” originally referring to plant or body tissues. The word later spread to textiles and modern materials.
When you hear “fiber optics,” it’s literally about tiny glass threads carrying light, just like plant fibers carry water. The same root idea of “threads” now connects your gut health, your clothes, and your internet.
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