it doesn't have to be particular meal that causes the attack, it might just be your overall condition. I remember that I experienced once quite strong gallbladder attack (I actually was starting to faint) - and back then I didn't know anything about liver flushes. Several months later, when I did LF, i passed huge stone of a size of golf ball. It was calcified and calcified stones grow only in gallbladder.
This only shows that I could function for several months without ANY symptoms and being quite unhealthy actually. The same might be with you. Diet alone for sure won't bring miracleous effects unless it's special 'liver-cleansing' diet followed by at least 8 weeks (during which you're exposed to next attacks anyway)