Combining protein with fruit as a carbohydrate source is the optimal macronutrient pairing for human metabolic function.

Caveats

• The claim extrapolates from a narrow, real benefit (protein blunting postprandial glucose spikes) to a sweeping conclusion about 'optimal metabolic function' — a logical leap no cited source supports.
• Major peer-reviewed sources (PMC, AMA) explicitly state that no single macronutrient pairing has been established as universally optimal, and that multiple dietary compositions can support metabolic health.
• Clinical guidance recommends pairing carbohydrates with protein and/or healthy fat and fiber as a general strategy — not specifically fruit as the carbohydrate source, and not as a uniquely superior combination over all others.