Cancer patients must speak to their doctor before taking weight-loss jabs, a charity has warned.

Macmillan Cancer Support said it felt compelled to issue the advice amid a rise in people seeking help over whether they can take them.

While ‘quick fixes’ may seem appealing, there is currently not enough evidence over how the drugs might affect anti-cancer treatments, it added.

The charity said more research is needed but it was already known the drugs may affect how other medicines are absorbed by the body.

This may include some anti-cancer drugs.