Olive oil and garlic. Bottles of olive oil next to bulbs of garlic, in a grove of olive trees (Olea europaea). Olive oil, used in cooking and to flavour salads, is high in monounsaturated fats, thought to be healthier for the heart. Garlic (Allium sativum) is used in cooking to give a strong flavour to many dishes. Certain chemicals in garlic are thought to reduce the risk of heart disease. Photographed in the Peloponnese region of Greece.