I think its poignant to note that your efficiency in digesting "poor" or "fair" combos is going to depend on your current state of digestive health, hydration and emotional poise. Another factor to consider is the individual peice of fruit, for instance a really really sweet strawberry mixed with banana may bring you little to no troubles, while a really tart strawberry will much more so. Another key concept to consider is the quantities mixed, if say you do 5/6 ths banana and 1/6th strawberry you probably will not notice any problems, while 1/2 and half will usually give you problems. Greens go great with all fruit, some even say watermelon although ill admit to me this sounds quite unappealing. To me there is nothing in this world that is black and white solid rules, rather tools for Optimal digestion. The way it can be made to sound would sudgest even a slight abberation would result in disaster n no nutrients being absorbed. The more delicate your digestion the more important to Really stick to 100% proper food combining and mono meals. Most find that sticking it "pure" becomes desired more n more till it simply is a preference. I know it is with me although I dont sweat it if I have something not "optimal" on occasion, my strong digestion can take it.