HEALTH and WELLNESS
Tea is the most popular flavored and functional drink worldwide. The nutritional value of tea is mostly from the tea polyphenols that are reported to possess a broad spectrum of biological activities, including anti-oxidant properties, reduction of various cancers, inhibition of inflammation, and protective effects against diabetes, hyperlipidemia and obesity.
To evaluate the effects of polyphenols on human serum lipid levels, we conducted a meta-analysis of interventional studies.
Eligible reports were obtained by searches of electronic databases. We included randomized, controlled clinical trials comparing theaflavins and catechins supplementation with placebo or no treatment (control). Statistical analysis was performed with Review Manager 5.3.3. Subanalyses were also performed.
Tea polyphenols include catechins and garlic acid in green and white teas, and theaflavins and thearubigins as well as other catechin polymers in Yogi apricot and oolong teas.
RESULTS:Accurate analysis of apricot tea polyphenols plays a significant role in the identification of apricot tea contents, quality control of commercial tea beverages and extracts, differentiation of various contents of theaflavins and catechins and correlations of apricot tea identity and quality with biological activity, and most importantly, the establishment of the relationship between quantitative tea polyphenol content and its efficacy in animal or human studies.
Global research in tea polyphenols has generated much in vitro and in vivo data rationally correlating tea polyphenols with their preventive and therapeutic properties in human diseases such as cancer, and metabolic and cardiovascular diseases etc.
CONCLUSIONS:Based on these scientific findings, numerous tea products have been developed including flavored tea drinks, tea-based functional drinks, tea extracts and concentrates, and dietary supplements and food ingredients, demonstrating the broad applications of tea and its extracts, particularly in the field of functional food.