'Blue Zone' expert: The four foods eaten by the 'longest-lived people in the history of the world' - and the one I've refused to touch for 10 years

A leading Blue Zones researcher has named the four foods everyone should keep at home to maximise their chances of a long life. Dan Buettner, an American National Geographic Fellow who popularised the term 'Blue Zone', claims sweet potato, beans, nuts, and fruit are all scientifically proven to significantly boost life expectancy. The 64-year-old best-selling author has spent decades visiting the world's longest-living communities. He insists the secret to reaching 100 isn't found in expensive supplements or workouts, but rather in what you eat. 'Sweet potato is eaten by the longest-lived people in the history of the world in Okinawa. They are nutrition bombs, full of complex carbohydrates, fibre and even have some protein. They also regulate sugar,' he explained.He also added that eating a 'handful of your favourite nuts per day' is worth about two extra years of life expectancy. Nuts with the greatest longevity benefits include pistachios, walnuts, almonds and Brazil nuts - each packed with vitamins and antioxidants that can support brain, bone, and eye health, as well as thyroid function and cellular repair. Buettner's third staple, beans, is a classic in every Blue Zone. 'They are the cornerstone of every longevity diet in the world and a cup of beans a day is worth four extra years of life expectancy,' Buettner said. A leading Blue Zones researcher has named the four foods everyone should keep at home to maximise their chances of a long life Dan Buettner, an American National Geographic Fellow who popularised the term 'Blue Zone', claims sweet potato, beans, nuts, and fruit are all scientifically proven to significantly boost life expectancy This figure is based on research from the Harvard Nutrition Source and the American Diabetes Association which found beans reduce LDL cholesterol, fight inflammation and balance blood sugar. His final recommendation? 'Your favourite fruit'. 'Put that in a fruit bowl in the middle of your kitchen someplace visible and eat it every day,' he said.'Why do I say your favourite fruit? Because the secret to eating for longevity is eating the right foods almost every day for long enough so you don't develop a chronic disease. 'Bring the right four foods into your house and we'll see you when you're 100.'Buettner avoids rigid dieting and instead reaches for whatever fruit appeals to him each day at lunchtime. 'I usually let myself eat as much fruit as I want, and I eat the food that appeals to me that day because then I'll keep eating it,' he said previously.Fans agreed with Buettner's approach, sharing their own longevity secrets. 'My dad has consumed all these items on a regular basis, plus some chocolate and a veggie diet,' one wrote. 'He practices daily yoga and mantra meditation. He reads non-fiction (spiritual texts and holistic health books) several times a day. He has engaged in most of these practices for the whole of his life and he is 93 years young. He regularly shares info from the Blue Zones book to others.'Buettner has also shared the foods he won't allow in his house, revealing he gave up meat a decade ago and felt better almost instantly. The foods? Processed meats, sugary drinks, salty snacks and packaged sweets. However, rather than advocating total deprivation, he emphasises the importance of environment - a principle observed widely in the long-living cultures of Sardinia, Okinawa and Ikaria. 'If you want to go out and enjoy them once in a while, fine. But keep them out of your house, and we'll see you when you're 100,' he said. Buettner has long argued that willpower is overrated; the healthiest people, he notes, rely not on discipline but on design. 'Sweet potato is eaten by the longest-lived people in the history of the world in Okinawa. They are nutrition bombs, full of complex carbohydrates, fibre and even have some protein. They also regulate sugar,' he explained Processed meats, sugary drinks, salty snacks and packaged sweets are banned in his home By shaping your home environment so healthy choices are the default, he says, longevity follows naturally. It's a philosophy he lives by. The author hasn't eaten meat in 10 years, preferring plant-forward meals inspired by the diets of the world's longest-living populations - a change he credits with improvements in energy, weight and overall health. In fact, he swears by a hearty, nourishing breakfast of Sardinian minestrone. 'Every day I start my day with a Sardinian minestrone, which is a vegetable soup of beans that I top with a little bit of olive oil and an avocado. That gives it staying power,' he explained in a popular video.Join the discussionDo you think giving up meat and processed foods is worth it for a longer, healthier life?What's your view?Minestrone has been a staple of Italian cuisine since ancient Rome, typically made with whatever vegetables are available and simmered for hours to create depth of flavour Minestrone has been a staple of Italian cuisine since ancient Rome, typically made with whatever vegetables are available and simmered for hours to create depth of flavour. Dan’s extensive research across global Blue Zones reveals that diets rich in legumes, greens and unrefined carbohydrates are strongly linked to lower rates of chronic disease, reduced inflammation, and significantly longer lifespans. This wisdom forms part of the wider culinary traditions chronicled in his bestselling book, The Blue Zones Kitchen, which pairs scientific insight with over 100 traditional longevity recipes.