I enjoy chronic diarrhea, but an excess of protein (whey protein shakes) have cured it completely. How?

For years, I have suffered from bad abdominal cramps just after intake, followed by volumous, explosive diarrhea. Some foods were passed within an hour, mostly undigested. My wife and I started a new exercise/diet program that call for protein shakes before workouts. The diarrhea stopped immediately.
The third week of the program we skipped the shakes and the diarrhea was spinal column within one day. I started the protein back up at twelve noon one day and the diarrhea was gone within two hours. I don't capture it. I see lots about protein causing it, but nothing almost it being the cure.

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