Botox injections can lead to depression, a new study has warned.

The jabs help you get rid of wrinkles by partially freezing muscles but scientists have found that they also stop people from being able to express their feelings visually.

That makes botox users keep their emotions bottled up and perceive the world in a negative way.

"Suppressing negative emotions is something we do every day to be polite," The Sun quoted Dr Judith Grub, who led the research in Holland, as saying.

"However, my research shows that paralysing muscles that help you to express emotion leads to internalising these feelings," Grub added.

In the study, 30 people were shown gruesome images. Some were allowed to show their emotions, while others were asked to keep a blank face.

The researchers found that those who did not show their feelings perceived the world as a worse place, and felt negative emotions for longer.

"Many people think, 'Oh, it's just botox - I can get it in my lunch break.' But they forget that there may be side-effects," Grub said.