&gt; Intestinal flora is something the medical community is just now beginning to research and understand.<p>What&#x27;s interesting is that intestinal flora can take time to adjust in response to dietary changes (wish I could find some good figures on precisely how long, but the whole field of research on the subject is so new). This means that those on a seemingly unhealthy diet can initially do far worse switching over to &#x27;unfamiliar&#x27; healthy food as their gut flora are presented with something they have little &#x27;experience&#x27; digesting.<p>In my own experience, cutting out grains and milk from my diet resulted in a good few months of problems before things settled down again which seemed very counter intuitive until I read up on the significant role gut bacteria play in digestion.