This versatile fruit is one of the staples of Mediterranean cuisine. Olives are a rich source of trace elements, vitamins, essential unsaturated fatty acids and polyphenol compounds. Vitamins A, E, D and K protect our cells from harmful free radicals and keep them in good condition. The fats in olives improve concentration and control your cholesterol level. The polyphenols contained in olives reduce stress and the risk of memory disorders.