The chocolate is called Lola and it contains ingredients designed to trick your body into thinking you are full and therefore restrict overeating, the UK's Daily Mail reported.

On display in Madrid for the international chocolate show, Lola will initially be sold only in Spain but there is the possibility of making its way to overseas markets, starting with the UK, if the product receives enough interest.

Before you book your trip to Spain, you might want to know that the chocolate does have a green tinge to it, due to some unusual ingredients, and it also costs almost $10 for a pack of five.

The inventors recommend people eat one or two of the chocolates an hour before eating to give the chocolates time to work effectively.

"They'll feel pleasantly full and less like eating to excess," inventor Armando Yanes said. "The chocolate has an intense flavour and extremely high antioxidant properties."

The colour of the chocolate is slightly green due to the addition of spirulina, a microscopic algae, which has high levels of nutrients that can have weight-loss benefits.

The makers also claim that amino acids in the recipe stimulate the production of a hormone in the brain that suppresses the appetite.

The idea of a product designed to suppress hunger is not a new one, weight-loss toothpastes, soups, pills and other forms of lollies have been tried with limited success.

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