This observation of higher polyphenolics in OLE than that in OFE was similar to the findings reached by Teleszko and Wojdyło (2015), who proved that the polyphenolic content (par- ticularly for phenolic acids and flavonols) in the leaf was significantly higher than that in their fruit within the seven selected species, e.g., apple, quince, Japanese quince, choke- berry, cranberry, blackcurrant and bilberry. The differences in the content of polyphenolic compounds between different mor- phological parts of plants resulted from the specific species. Actually, they suggested that the synthesis of polyphenolic com- pounds in plants depends on the degree of sunlight exposure and water relations during the vegetation period. Based on it, the olive leaf probably gets more sunlight exposure and water than the olive fruit. In addition, Tattini et al. (2004) found an interesting phenomenon that the Ligustrum vulgare leaves from the shaded side of a bush (light exposure 6%) contained 3-fold less polyphenols than those grown under full sunlight expo- sure (100%). With this, the degree of plant maturity depends on polyphenol concentrations in plant tissues (Wang & Lin, 2000). This fact was further confirmed by our findings of phe- nolics in OLE and OFE.