Eating seven or more portions of fruit and vegetables a day is healthier than the five currently recommended and would save more lives, researchers say.
A study of 65,226 men and women indicated the more fruit and vegetables people ate, the less likely they were to die - at any age.
"Seven a day" cut death risk by 42%, "five a day" by 29%, it indicated.
But the government says its "five-a-day" advice is sufficient and that many of us struggle to achieve even this.
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The clear message here is that the more fruit and vegetables you eat, the less likely you are to die at any age”
Dr Oyinola Oyebode
Department of Epidemiology and Public Health, UCL
Experts said other lifestyle factors, such as not smoking or drinking excessively, may have accounted for the drop in mortality, not just fruit and veg consumption, although the study authors said they had tried to account for this.
The University College London researchers used the National Health Survey, which collects data from people in the UK each year through questionnaires and nurse visits, to look at diet and lifestyle.
They analysed data between 2001 and 2008, which provided a snapshot rather than people's continuing dietary habits throughout the seven-year period.
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Five a day
The five-a-day message is based on advice from the World Health Organization
It highlights the health benefits of getting five 80g (3oz) portions of fruit and vegetables every day
Your five portions should include a variety of fruit and vegetables
Most fruits and veg count towards five a day
The government says it can include fresh, frozen, canned, dried or pure juices
Potatoes and cassava don't count because they mainly contribute starch to the diet
Death risk from any cause decreased as fruit and veg consumption increased.
Risk of death by any cause was reduced by:
14% by eating one to three portions of fruit or veg per day
29% for three to five
36% for five to seven
42% for seven or more
Fresh vegetables had the strongest protective effect, followed by salad and then fruit.
Fruit juice conferred no benefit, while canned fruit appeared to increase the risk of death - possibly because it is stored in sugary syrup, say the researchers.
woman eating broccoli Fresh vegetables appeared to offer the most protection
Lead investigator Dr Oyinlola Oyebode said: "The clear message here is that the more fruit and vegetables you eat, the less likely you are to die - at any age."
She said the size of the effect was "staggering", but added that eating a few portions a day was still better than nothing.
'Struggling' for five
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You cannot extrapolate from this kind of information to make sensible pronouncements about what people should eat”
Prof Tom Sanders
School of Medicine, King's College London
Fruit and vegetables could have a protective effect against disease as they contained antioxidants, which repair damage to cells, she said.
Experts said the work was not conclusive and that other lifestyle factors may have influenced the results.
Prof Tom Sanders, at the School of Medicine, King's College London, said it was "already known" that people who said they ate lots of fruit and vegetables were health conscious, educated and better-off, which could account for the drop in risk.
"You cannot extrapolate from this kind of information to make sensible pronouncements about what people should eat."
Prof Naveed Sattar, of the University of Glasgow, said promoting a seven-a-day message would be "really challenging".
"It would require governmental support such as subsidising the cost of fruit and vegetables, perhaps by taxing sugar-rich foods, and making available high quality products to all in society," he said.
A spokeswoman for Public Health England said it "welcomes this new research, which supports existing evidence showing the health benefits of consuming fruit and vegetables".
But she added about 66% of adults did not eat five a day and some only ate one.
She said the organisation would focus on increasing the "overall" consumption of fruit and veg to cut the risk of disease.
Victoria Taylor, senior dietician at the British Heart Foundation, said people were still struggling to meet the existing target of at least five a day.
"While you may not be getting your five a day, there's no reason to give up and stop trying as this study showed there were health benefits for every extra portion of fruit and veg people ate," she said.
In Australia, the government's advice is "two plus five" a day - encouraging people to eat two helpings of fruit and five portions of vegetables.
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