Why do I purge after eating vegetable food?

Google will do justice and If not satisfied go see the doctor

Since you started eating more fruits, vegetables, and whole grains, you may need to poop more often. That’s because these foods are higher in healthy fiber, which helps control blood sugar, prevent heart disease, and improve colon health. The side effect, however, is that you will go to the bathroom more often

If it is something that is consistent it better you talk to a health professional..