The role of nutrition in the prevention of many diseases is indisputable - it is crucial in the context of many conditions, including diseases of civilisation. Also, mild cognitive impairment, which can result in the development of dementing conditions, can be reduced through diet as a result of the consumption of specific nutrients. Many experts speak of caffeine, ginseng, ginkgo biloba, viatamins or omega-3 fatty acids, but as of today, there are no studies that conclusively prove their effectiveness.