Hydroxy Citric Acid (HCA) is sold as a supplement due to its action as an appetite suppressant, and as it inhibits the action of the enzyme ATP-citrate lyase in the liver. This enzyme catalyses the conversion of dietary carbohydrate into fat (Hunt & Groff 1995). Studies on animals have shown its benefits to weight control as they eat less and make less fat. There is no good human data, and anecdotally, there are few opinions. To be honest, I don't think there's any benefit at all from using an HCA supplement.
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