Digestion is a huge part of health - it is not so much what we eat, but what we digest. Even if you have a very healthy diet but your body doesn't digest it - not so good... Many medicine systems such as homeopathy, Chines Medicine and such take poo very serious and it is a clear indication of the state of ones health.
Yes~
Everyones body is different and there is no such thing as a "perfect" food. You must find what digests for your body type and lifestyle!