It would be better if you practice kapalabhati on empty stomach, in the morning, not only should you practice kapalbhati before eating but also after attending to natural call to clear your bowels. In this way, the practice of kapalabhati should not interfere with the digestion process after eating or futility with faecal waste in the rectum while doing this exercise. In nutshell, it should be 'No'. If you have some other issue, you can write back to us to discuss otherwise.