Biohackers want to make their bodies and brains function better by "hacking" their biology.

The Victoria Derbyshire programme meets the people who are inserting technology under their skin, adopting extreme diets and trying to change their DNA.

Watch Catrin Nye's full film here.

Watch the Victoria Derbyshire programme on BBC Two and BBC News Channel, 10:00 to 11:00 GMT - and see more of our stories here.