Olive-oil fraud was already common in antiquity. Galen tells of unscrupulous oil merchants who mixed high-quality olive oil with cheaper substances like lard, and Apicius provides a recipe for turning cheap Spanish oil into prized oil from Istria using minced herbs and roots. The Greeks and the Romans used olive oil as food, soap, lotion, fuel for lamps and furnaces, a base for perfumes, and a cure for heart ailments, stomach aches, hair loss, and excessive perspiration. They also considered it a sacred substance; cult statues, like the effigy of Zeus at Olympia, were rubbed regularly with oil. People who bathed or exercised in Greek gymnasiums anointed their bodies as well, using oils that were scented with pressed flowers and roots. Some scholars link the central place of olive oil in Greek sports, which were performed in the nude, with the rise of bronze statuary in the sixth century B.C…