PROBLEM TO BE SOLVED: To provide a protein glycation reaction production inhibitor containing an after fermentation tea in which a protein glycation reaction inhibitory action is enhanced by performing an after fermentation treatment of a tea made from something other than Camellia Sinensis which is drunk as a so-called healthy tea.SOLUTION: In order to solve the above problem, provided are a protein glycation reaction inhibitor containing an after fermentation Rooibos tea in which a protein glycation reaction inhibitory action is strengthened by performing an after fermentation treatment of the Rooibos tea, the protein glycation reaction inhibitor containing an after fermented Cassia mimosoides tea in which the protein glycation reaction inhibitory action is strengthened by performing the after fermentation treatment of the Cassia mimosoides tea, the protein glycation reaction inhibitor containing an after fermentation Rubus suavissimus tea in which the protein glycation reaction inhibitory action is strengthened by performing the after fermentation treatment of the Rubus suavissimus tea, the protein glycation reaction inhibitor containing an after fermentation Diospyros kaki leaf tea in which the protein glycation reaction inhibitory action is strengthened by performing the after fermentation treatment of the Diospyros kaki leaf tea, and the like.【課題】いわゆる健康茶として喫飲されている茶外茶に後発酵処理を施すことで、蛋白質糖化反応阻害作用が増強した後発酵茶を含む蛋白質糖化反応生成阻害剤を提供することを課題とする。【解決手段】上記課題を解決するために、ルイボス茶を後発酵処理することにより蛋白質糖化反応阻害作用が強化された後発酵ルイボス茶を含む蛋白質糖化反応阻害剤、ハマ茶を後発酵処理することにより蛋白質糖化反応阻害作用が強化された後発酵ハマ茶を含む蛋白質糖化反応阻害剤、甜茶を後発酵処理することにより蛋白質糖化反応阻害作用が強化された後発酵甜茶を含む蛋白質糖化反応阻害剤、柿の葉茶を後発酵処理することにより蛋白質糖化反応阻害作用が強化された後発酵柿の葉茶を含む蛋白質糖化反応阻害剤などを提供する。【選択図】図２
