Resumen
On 7 September 1191, a fierce battle took place in Arsuf (Palestine) between the Crusaders (marching south towards Jerusalem) led by King Richard the Lionheart and the Ayyubid army commanded by the sultan Saladin. The confrontation lasted for most of the day and terminated with a victory of the Crusaders, proving Richard?s courage as a soldier and his skill as a commander while denting Saladin?s reputation as an invincible warrior. The site (today known as Apollonia) holds the ruins of a Crusader castle perched on a cliff over the sea. We recovered plenty of pottery shards among which we could distinguish those of the Crusaders from those of the Ayyubid army. Extraction of food remnants confirmed that the Crusaders? diet consisted mostly of pig and sheep meat (together with cheese), with a minimum of carbohydrates (what today would be termed a ?ketogenic? diet), whereas the Muslim army consumed mostly carbohydrates (wheat, Triticum durum, Hordeum vulgare), together with fruits and vegetables, with minimal levels of sheep meat and cheese. As a result, the Crusaders? diet had a positive effect on their slenderness and ?cardio?. This might have been why the Ayyubid army lost ca. 10 times more soldiers in Arsuf. Shrewdness of leaders and soldiers? equipment and willingness to fight are, of course, the main ingredients of victory, but diet too might not have a secondary role and help to tip the balance.