Fiber
Fibre, Textile
noun, の adjective
The fiber you use to maintain your own health is the fiber you eat!
せんい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
毎日サラダを食べて、ちゃんと食物繊維を摂るようにしています。
I eat a salad everyday and consume the perfect amount of dietary fiber.