Redo, Im very glad that you posted this as I have started research into gut bacteria. As you stated, there is a very strong correlation between CFS/Fibromyalgia and abnormally high levels of bad gut bacteria. Proper levels of good gut bacteria are essential to proper bodily functioning, including but not limited to the key areas of vitamin and mineral conversion and absorption -especially those relating to neurological function (common problem amongst PWC's). AB's are known to disrupt gut bacteria balances, in favour of the bad and as many PWC's have no doubt been prescribed these, many are likely to be affected. NSAID's adn acidity regulators such as Mylanta and Nexium also detrimentally impact gut bacteria. I am coming to believe in the "gut-brain axis" as it is often called. The gut is called the second brain for good reason. Many of the vitamins required for proper neurological functioning are processed and absorbed in the gut. I believe taking probiotics (in pearl form) can only assist any other protocols that a PWC may be on. For example, restoring the gut may remedy in the "break" that causes methylation problems (genetics aside ofcourse). Ditto for other protocols. I personally do not think that it is the "sort of bacteria mix in their SIBO which would cause CFS symptoms" but the "interference" in normal bodily processes which SIBO disrupts that in turn, eventually, causes CFS symptoms. When you start to look into this, there is so much information that it cannot be ignored and in my opinion needs to be addressed as a support to other protocols also. The number of bacteria in our bodies outnumber body cells 10:1 - essentially we are hosts for bacteria! These bacteria evolved over many millions of years with us and as evolution takes 100's of thousands of years to result in even a small change, the changes to our basic diet over the last 40-50 years are so great that our bodies are not designed to cope and cannot adapt in such a small time frame. I personally believe that diet is one of the reasons why so many are ill with "garbage bin" diagnoses such as CFS - by garbage bin, I mean that the causes and cures are not known and similar symptoms are dumped in as one syndrome or anotehr. Unfortunately, curing the gut will not happen overnight. It can take 3 months - 2 years and must be assisted by eliminating foods that encourage the population of bad bacteria in the gut. I think by and large my diet is appropriate (no carbs other than vegetables and no sugars other than occasional fruit) but I will start by supplementing with homemade kefir which is very high in probiotics and much higher than yoghurt. I plan to build on from there. Interesting thread and I look forward to others view. I have some links that I can share but will need to post later as I must log off now.