and high environmental pollution. The consumption of fruits and vegetables is highly recommended to support the body in this respect. The main antioxidants found in fruits and vegetables are A, E, and C vitamins; β-carotene; lycopene; and a diverse group of compounds named phenolics. Therefore, it is hard to select one specific compound responsible for health benefits. That is why, Ohr [2004] stated that "scientists are currently studying how mixtures of antioxidants … work together. They are looking for synergistic effects among individual antioxidants." The most important group of antioxidants is the phenolic compounds (Figure 1). They are organic chemical compounds with at least one phenol unit, represented by, i.a., tannins (hydrolysable and condensed), flavonoids, and lignans. Phenolic compounds can be found in a variety of plant species. Their high content is correlated with antioxidant activity, which decreases the risk of coronary disease and protects against neurodegeneration [Giacalone et al., 2015]. The positive effect of flavonoids on memory improvement was also studied [Whyte & Williams, 2011]. Of 12 epidemiological surveys about coronary heart disease risk assessment compared by Arts & Hollman [2005], seven demonstrated the protective effects of a diet enriched with polyphenols. An inverse relationship has also been determined between poly

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