When it comes to our nearest and dearest, most of us know the little signs to look out for to identify if they're telling a lie.
For others it's not always so easy, but experts have now revealed that one simple behavioural habit could be a major red flag to hint we're not being told the truth.
A study found that when we lie, we are more likely to copy the behaviour and body language of the person we are lying to - and there's a very good reason why.
When we lie our brains are forced to work overtime in an effort to keep up the pretence. This means the thoughts controlling our body language resort to mimicking what we see, as this can be done unconsciously and it's less effort than thinking for ourselves.
Read more on mirror.co.uk