Sugar
Most surgeons have a specific number of grams they recommend you stay within. Mine recommends that each serving/meal should have less than 5g of sugar. (The only exception is yogurt because the sugar is normally from the milk lactose.) I seem to do fine with up to 10g per meal and it makes life a bit easier to stay within that range.
Was the bean salad homemade or store-bought? If it was store-bought I wouldn't be surprised if they added sugar to the recipe to add flavor. If it was homemade and you know there was no added sugar, try to figure out what else was in the salad that might have contained natural sugars. Normally natural sugar works fine with post-ops in limited quanities. (Although I still have issues with the sugars in bananas - go figure.)
HTH
Pam
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The scale can measure the weight of my body but never my worth as a woman. ~Lysa TerKeurst author of Made to Crave