Type the words “health tips”, “longevity” or “biohacking” into social media search bars and inevitably you will plunge down a rabbit hole of bad advice, weirdness, and lies. But if you’re lucky you’ll land on the account of NHS doctor Karan Rajan. He’s one of the good guys, with over 10 million followers who watch his videos for no-nonsense, science-backed advice on everything from endometriosis to chia seeds.

We’re all looking to find ways to live a longer, healthier life , – but Dr Rajan says there’s no point spending a fortune on new-age tech or handfuls of supplements if you don’t get the basics right.

“Biohacking and longevity lend themselves to the idea that there is some secret recipe, or a single tablet, or one intervention that you can do which will unlock this new evolution f

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