Male fertility could be significantly affected by exposure to "forever chemicals" after a study in animals raised concerns about potential generational effects.

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PFAS, or per- and polyfluoroalkyl substances, are a group of 15,000 toxic, synthetic chemicals used for their resistance to heat, stains and grease.

Science around the chemicals is evolving but previous research has found exposure can be associated with increased cholesterol levels, reduced kidney function, lower birth weight in babies and other health issues.

A study by the University

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