Bioactive ingredients, including both bioactive compounds and bioactive live organisms, are present in small amounts in natural sources such as fruits and vegetables. These ingredients have been continuously investigated during the last few decades and the epidemiological data suggest that their intake is associated with significant decreased risk of various disorders and chronic diseases owing to their anti-oxidant, anti-bacterial and anti-inflammatory qualities. Some of these natural ingredients such as catechins, curcumin, resveratrol, oleuropein, quercetin, rutin, hesperidin,...