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Acetylation and deacetylation of lysine residues on histones, which are catalyzed by histone acetyltransferases (HATs) and histone deacetylases (HDACs), are epigenetic modifications that play a very important role in the regulation of gene transcription. Perturbation of the balance between histone acetylation and deacetylation leads to a myriad of diseases, including cancer, AIDS, malaria, neurodegenerative diseases, and diabetes. HATs and HDACs have recently been recognized as key targets for chemoprevention and drug discovery, and numerous natural and synthetic compounds have been screened in order to identify promising regulators of subtle balance between histone acetylation and deacetylation. Here, we present dietary compounds and other natural products that have emerged as potent HAT or HDAC activity modulators, and we discuss their current and future applications as chemopreventive or …