When an undiagnosed rare genetic disease caused his young sons kidneys to fail, Professor Chris Toumazou vowed to find a way of uncovering hidden health risks.

The professor of biomedical engineering realised that, although his sons condition could not have been prevented, the family could have managed his lifestyle very differently had they known about his condition.

So, he embarked on a mission to help people change their lifestyles and avoid getting sick.

Lifestyle, he says, has a huge impact on many undiagnosed conditions such as diabetes and high blood pressure. Changing behaviour could save lives.

The result of his research is a simple wristband that uses your DNA to help you make healthy choices as you shop for groceries.

By analysing the part of your genetic code determining susceptibility to nutrition-related health conditions like diabetes, DNANudge tells you which foods are best for you, and which you should avoid.

DNANudge analyses your genetic code and tells you which foods are best for you, and which you should avoid.

Image: DNANudge

The wristband scans shop barcodes and shows a green light if a product is OK and red if it may be harmful in the long run. The wristband's linked smartphone app suggests healthier alternatives when the red light comes on.

Following his sons acute illness, Toumazou also invented a microchip that can read an individuals DNA from a simple mouth swab sample. Its now used to upload a DNA profile to the new wristband a process that takes an hour instead of up to eight weeks for a conventional DNA test.

"We're not telling people they can't eat biscuits, that they should eat grapes. No, they can eat biscuits, but eat the better biscuits based upon your DNA and lifestyle," says Toumazou.

"It's using biology to nudge and guide you to have a healthier lifestyle in the long term."

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The device also helps to promote overall health by warning if you are inactive for too long. An orange light means it's time to get up and move about.

One in 10 people with pre-diabetes, a reversible condition, will go on to develop type 2 diabetes, which affects more than 400 million people worldwide. Early diagnosis can enable people to change their lifestyles and avoid developing the full-blown condition.

And what about Toumazous son Marcus? Well, his story has a happy ending. After months in dialysis he received a kidney transplant and is now in good health.

He even met the Queen at the opening of his fathers new lab in London. He told her his father was changing healthcare by making microchips for the human body.

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This wristband tells you what food to buy based on your DNA - World Economic Forum