The latest social media trend known as the '10 year challenge’ has got people talking about the way they look.

It’s flooding social feeds everywhere and requires people to simply post two images of themselves side by side, one from 10 years ago and one as they are now.

People then post comments about the photographs, they can be both positive and negative about someone’s appearance.

But what is the point of a challenge like this? Why are we so intrigued with the ageing process, and what does this tell us about our views on body image.

In this BBC Teach clip, campaigner Stephanie Hart has been investigating beauty ideals from around the world, and the people responsible for promoting them.

She takes a trip around the world to look at the vastly different body and beauty ideals for men and women from the tribes of Africa, through to the Middle East and South East Asia.

Here are a few examples of beauty trends that may make you squirm.