Abstract: A formulation for maintaining physiological resilience during conditions of sustained physical activity can include a carbohydrate blend, a fatty-acid blend, and an amino-acid blend in a powder form that immediately dissolves in fluid water. The carbohydrate blend can include simple and complex carbohydrates providing less than 70% of total calories of a complete meal in a complete meal-equivalent (“CME”) dose of the formulation. The fatty-acid blend can include medium-chain fatty acids, long-chain fatty acids, and very-long-chain fatty acids. The fatty-acid blend can provide less than 50% of the total calories of the complete meal in the CME dose of the formulation. The amino-acid blend can include essential amino acids (“EAAs”) and non-essential amino acids. The EAAs can provide 60-80% by weight of the amino-acid blend. The EAAs can provide less than 30% of the total calories of the complete meal in the CME dose of the formulation.