Why am I dumping all of a sudden from eating blueberries when I was fine before?

Every day, i have a whey protein shake. I usually put some bluberries on it to make it taste a little bit better. Im always fine whenever I do this. This time ten or fifteen minutes after I drank it, I felt as if their were fireworks in my intestines. I had dumping once but after i was fine. I know dumping is usually caused from sugar, but why am I dumping from the bluberries all of a sudden?

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