Check Table 1 in Presence of Inulin and Oligofructose in the Diets of Americans. Notice the mid-point value for inulin in banana is 0.5 grams / 100 grams of raw banana. This is very small compared to the amount in Chicory root (41.6 gr), Jerusalem artichoke (13.5 gr), onion (4.3 gr), leeks (6.5 gr), asparagus (2.5 gr) and wheat (2.5 gr).
Inulin is a fructan, a rapidly fermenting soluble fiber and a prebiotic. In larger amounts like the amount taken in Jerusalem artichokes or a soluble fiber supplement it is know to be problematic for many IBSers cause gas, cramps and/or discomfort (see Heather's comments on inulin).
I have difficulties with inulin in some foods but not the amount in 1/2 banana that I eat each morning. It is a great soluble fiber especially when it is a bit on the green side of yellow. I cannot eat them ripe bananas because the fructose content is higher due to starch breakdown.
Lactobacillus acidophilus and Bifidobacterium bifidum are excellent probiotics that are available in a variety of forms including soy yogurt and capsule. There is no need to get from yogurt.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS
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Re: Bananas and Yogurt
I cannot eat them ripe bananas because the fructose content is higher due to starch breakdown. 
