Chocolate may contain a chemical with anti-ageing properties – but don’t start stuffing your face just yet. The chemical is found mainly in dark chocolate and it remains to be seen whether eating chocolate is good for you overall.

“There’s lots of things in dark chocolate, and there are pros and cons to everything,” says Ramy Saad at University College London.

The chemical in question, theobromine, is probably best known for being deadly to dogs. But it has…