“…Different cohort studies in different countries with different ages, genders, and races ( Li et al, 2016 ) reveal that the consumption of Camellia sinensis tea (common tea) has different sensitivities in different ethnic groups due to inconsistent specification and lack of standardized procedure to prepare the C. sinensis tea ( Yu et al, 2017 , Wang et al, 2014 ). Herbals that are rich in tannins as apple, blueberry, cinnamon, grape seed/-peel, neem, pomegranate peel, and sorghum have a potent anti-diabetic effect ( Munyangi et al, 2020 ), whereas juices from fruits apples, blueberry, grape, and pomegranate do not have tannins so barely have any glycemic impact ( Muraki and Imamura, 2013 ). Polysaccharides inhibit the absorption of glucose in the intestine and alleviate β-cell dysfunctions ( Wang et al, 2011a , Wang et al, 2011b , Wu et al, 2016 ).…”