In another thread, Richvank posted: I am just wondering whether these bacteria that ferment sulfur-containing amino acids are one and the same as SULFUR-reducing bacteria (bacteria that reduce elemental sulfur to hydrogen sulfide), and if they are a source of hydrogen sulfide in ME/CFS patients. Furthermore, if SULFUR-reducing bacteria (as opposed to SULFATE-reducing bacteria) are involved in making hydrogen sulfide in some ME/CFS patients, might a low sulfur diet be the answer for these patients, as a means to limit the hydrogen sulfide production? A low sulfur diet essentially involves avoiding cruciferous vegetables (cauliflower, cabbage, cress, broccoli and similar green leaf vegetables), all dairy, eggs, onions, peas, which are all high in sulfur (thiols), so the low sulfur diet is relatively easy to follow. A full list of foods that are high in sulfur (thiols) is given here: http://livingnetwork.co.za/chelationnetwork/food/high-sulfur-sulphur-food-list/ Could such a low sulfur diet help treat ME/CFS, by reducing hydrogen sulfide levels ?? I came out as a strong positive on de Meirleir's hydrogen sulfide urine test (the neurotoxic metabolite test). Now, from my Genova Diagnostics Digestive Stool Test, I know have the bacterium Proteus mirabilis in my gut, and I believe I also have Proteus mirabilis as a chronic recurrent kidney infection that I can never get rid of. (The other bacteria in my gut are: alpha hemolytic Streptococcus, gamma hemolytic Streptococcus, Staphylococcus aureus, hemolytic Escherichia coli) Anyway, since Proteus mirabilis is a SULFUR-reducing bacteria (along with Campylobacter, Pseudomonas and Salmonella), could Proteus mirabilis be making hydrogen sulfide from the sulfurs in my diet, either in my gut or in my kidneys, where this Proteus mirabilis resides? Anyone familiar enough with the chemistry to answer this question?