According to the medic and producer, who sadly died suddenly last June after going for a walk on the Greek island of Symi, some studies have shown green tea can boost caloric burn.
Studies conducted on overweight volunteers in Thailand have shown that consuming even a small dose of green tea can burn approximately 60 calories per day, roughly equivalent to walking for 20 minutes.
'It certainly does seem to have an impact on metabolic rate,' Michael said in the show via The Sun.
Explaining the theory, Mosley said: 'In one Thai study, overweight volunteers who took a small dose of green tea extract before each meal saw the amount of energy they burned at rest go up by about 60 calories a day.
'That's roughly the same as walking for 20 minutes, without leaving the sofa,' the expert said.
Green tea is widely available in the UK, with 20 20-bag box costing as little as 75p from Tesco, meaning weight watchers could burn 60 calories for less than 4p - a significantly cheaper alternative to controversial and pricey options such as Mounjaro.
Filmed prior to his sudden passing, the new series documents Mosley's travels around the world as he sets his sights on discovering the secrets and the science behind ageing well.
In the fifth episode of the landmark series, Mosley travelled to New York's Chinatown to sample some of the nation's most prized brews.
Mosley sipped on bilou chun tea, a famous variety of Chinese green tea originating from the Dongting mountain region.
Green tea retains its vibrant green colour by specific methods of production. After the tea leaves are picked, they are quickly pan-fried or steamed to prevent them from oxidising.
This locks in catechins, flavour compounds that are thought to work alongside caffeine to create a fat burning effect in the nervous system.
It is significantly more impactful in comparison to other varieties of tea, with green containing four times the catechins compared to the average builder's.
Studies performed have largely revealed the effect of green tea in pill form, but Mosley explained that sipping on as little as one or two cups should also offer metabolism-boosting compounds.
Additionally, studies have revealed that green tea could also have a positive effect of lowering the risk of type 2 diabetes, and even slow ageing.
Nutritionists have warned that it's effects can't offer the same potency as stronger medical weight loss treatments, but that it could help with overall health in the long run.
'If you want to burn through the calories that little bit quicker, green tea might just be the tonic,' he said.
Michael Mosley's Secrets of the Superagers aired on Thursday at 8pm.
It comes as Japan reported that it is beginning to see a shortage in the hugely popular matcha green tea, a trendy variety of the drink touted for its health benefits promoted by influencers.
The tea, made from the finely ground powder of green tea leaves specially grown in shade, has been loved by Japan in particular since the 12th century when Buddhist monks introduced the nation to it.
Over the past decade, production has nearly tripled, with Japan producing 4,176 tonnes of matcha in 2023.
Consumption of the antioxidant-rich green tea 'reached a record high last year', according to Fumi Ueki, the chief of one of Japan's largest tea companies.
And soaring demand, largely driven by online trends, has prompted warning of further shortages this year.
Major influencers like Sophie Habboo and Kourtney Kardashian have espoused the benefits of matcha.
Matcha tea is made by combining fine matcha powder and hot water with a special matcha whisk, which is used to form a creamy foam that sits on the tea.
Proponents say the tea can boost the brain's health, due to its high concentration of polyphenols, chlorophyll, caffeine and L-theanine.
The demand largely comes from outside Japan - while matcha and leaf green-tea consumption has fallen inside the country, global sales are expected to nearly double from £2.2bn in 2023 to £3.9bn by 2028.
In the past year alone, sales of matcha products have doubled in the UK. The arrival of the US cafe Blank Street to Britain's high streets in 2020 is thought to have led to a surge in the popularity here, with its range of matcha teas combined with other flavours such as blueberry and white chocolate.
The spike in demand has become such a problem that last year two of Japan's biggest tea companies, Ippodo and Marukyu Koyamaen, announced unprecedented purchase limits on matcha products.
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