Any change of diet, even to a really healthy way of eating, can upset bowel regularity. Please note that you should only see bowel activity as constipation if you are in discomfort. If you are putting less (fibre) in and therefore less needs to come out and you are not in discomfort, this is a good thing, not a bad thing! Only if you are in discomfort should you be concerned and then these suggestions should help:
Constipation can be greatly helped by the following:
