What condition results from a diet consisting almost entirely of lean rabbit meat, lacking sufficient balancing nutrients?

Protein poisoning or "rabbit starvation."

Rabbit starvation, also known historically as protein poisoning, is a dangerous physiological condition that arises specifically when an individual consumes a diet composed almost exclusively of very lean protein, such as rabbit meat, without adequate intake of fats or carbohydrates. The human body requires fats or carbohydrates to properly metabolize the large influx of amino acids delivered by an all-protein diet. When the liver becomes overwhelmed by the amino acid load and cannot process them efficiently, the body begins to suffer systemic distress. Symptoms manifest despite the stomach feeling full and can include severe diarrhea, nausea, lethargy, and potentially lead to death if the dietary imbalance is not corrected. This historical warning persists as a cautionary tale about rabbit meat, even though modern consumers rarely face such survival conditions.