Vegetarian Diet
noun, verbal noun, の adjective
If you eat vegetable food you are on a vegetarian diet.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
夕食はできるだけ菜食するようにしています。
I try to be on a vegetable diet for dinner as much as possible.
菜食の生活を続けてもう三年になりますが、時々無性に焼肉が食べたくなる時があります。
I have been on a vegetarian diet for three years already, but sometimes I have an irresistible craving for yakiniku.