Which specific intolerance is linked to adverse gastrointestinal effects like stomach pain and diarrhea upon amaranth consumption?
Answer
Intolerance to lysinuric protein
While general digestive upset can occur from high fiber or saponin intake, there is a specific metabolic intolerance that mandates strict avoidance of amaranth. Individuals diagnosed with an intolerance to lysinuric protein must avoid amaranth entirely. Consumption in this particular group has been directly associated with adverse gastrointestinal outcomes, including pronounced symptoms such as stomach pain and diarrhea, indicating a specific metabolic incompatibility with the protein structure of the grain.

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