What is the primary concern with high-protein diets for athletes with pre-existing conditions?

The primary concern with high-protein diets for athletes with pre-existing conditions is potential stress on the kidneys. Protein metabolism produces nitrogenous waste as a byproduct, which the kidneys must filter out of the blood. In athletes who already have compromised kidney function, increased protein intake can exacerbate their condition, leading to further kidney damage or dysfunction.

For individuals with healthy kidneys, the body efficiently processes dietary protein, but those with pre-existing kidney issues may struggle to manage the additional workload that comes from high protein consumption. Therefore, it's crucial for such athletes to consult healthcare professionals to tailor their diet to meet their specific health needs while minimizing risks to their kidney health.