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Effects of substituents on the acidity of phenols: Existence of electron attracting group, (for example-NO2, -X, - NR, -CN, -CHO, -COOH) on the benzene ring increases the acidity of phenol since it enables the ring to draw much more electrons from the phenoxy oxygen and so releasing easily the proton.
Phenolic acid and phytates are antioxidants. Then there are the isoflavones, which are weak phytoestrogens (estrogen-like compounds found in plants). Isoflavone levels vary in different types of tofu and soy milk products. Your body's estrogen is much, much stronger than the estrogen-like isoflavones in soy.