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Age-associated disease: Possible metabolic therapy Boosting levels of a byproduct of fatty acid breakdown may help alleviate the symptoms of age-associated health conditions. When the body is low on glucose, it breaks down fatty acids for energy, generating byproduct metabolites called ketones. The ketone β-hydroxybutyrate (β-HB) regulates cellular signaling and gene and protein expression. There are indications that ketogenic diets or ketone administration, which increase β-BH may prevent ageing-associated progression of illnesses like cardiovascular and neurodegenerative diseases and cancer. Young-min Han and co-workers at Georgia State University in Atlanta, USA, reviewed current understanding of β-BH and its molecular targets. β-BH is a potent metabolite small enough to filter through cell membranes and circulate throughout the body, including the brain, influencing signaling pathways. Further investigations into associated molecular mechanisms will verify the metabolite’s potential as a therapeutic agent.