[The Roman legionnaire, the misunderstood athlete].

Area of Science:

• Historical nutrition
• Human energy expenditure
• Military logistics

Context:

• Comparing energy expenditure and dietary intake of Roman legionnaires across two millennia.
• Assessing the nutritional adequacy of Roman military rations versus contemporary standards for soldiers and athletes.
• Investigating the impact of diet on the physical performance and health of Roman soldiers.

Purpose:

• To compare the energy expenditure and dietary intake of Roman legionnaires with modern soldiers and athletes.
• To evaluate the nutritional balance and adequacy of the Roman legionnaire's ration.
• To understand the long-term health implications of the Roman military diet.

Summary:

• Roman legionnaires performing engineering work expended an estimated 5000 kcal daily, increasing to 6000 kcal during combat.
• The standard daily ration provided approximately 3500 kcal, primarily from carbohydrates (78%), supplemented by the legionnaire's initiative.
• While providing slow carbohydrates and energy, the ration was unbalanced and risked long-term deficiencies, unlike modern high-energy diets.

Impact:

• Highlights the historical challenges in meeting the high energy demands of military personnel.
• Provides insights into the nutritional strategies and limitations of ancient armies.
• Informs understanding of the relationship between diet, physical exertion, and long-term health in demanding occupations.