Beyoncé, the Kardashians and Chrissy Teigen have all been name-checked in a list of 2019's worst health fads.
Leading dietitians have revealed five of the worst tips they've come across this year that should be avoided in 2020, including Beyoncé's 22-day diet.
The British Dietetic Association (BDA) urged dieters to remember it takes longer than 22 days to boost health through food.
And the body also slammed hair gummies - promoted by the Kardashians for being based on 'zero evidence'.
IV drips, which are endorsed by model Chrissy Teigen and singer Rihanna, could also be dangerous, the BDA said.
The BDA said it comes across an enormous amount of bizarre claims - and celebrities are at the forefront of some 'laughable' fads.
Here, MailOnline breaks down the verdict from several registered BDA dietitians on the five trendy fads.
Hair gummies have been rated as one of the top five wildest fad claims by The British Dietetic Association's (BDA).
The sweets are regularly promoted by Kim Kardashian on Instagram (December 2018)
Promoters claim IV vitamin drips can do almost anything, including burning fat, quickly fixing a hangover, boosting energy levels, fighting jet lag or strengthening the immune system.
Who's a fan? The market has boomed in recent years since singer and businesswoman Rihanna and model Chrissy Teigen posted photos of themselves hooked up to a vitamin cocktail IV in 2012 and 2015 respectively.
BDA verdict: There is no evidence that taking vitamins via an IV drip has any benefits for most people, and this invasive procedure can be dangerous.
Chrissy Teigen posted this image on Instagram in 2015 and wrote: 'Hello body meet vitamins'
Rihanna posted an image of herself getting an IV drip way back in 2012, triggering a craze