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The diets cutting one in five lives short every year

James Gallagher
Health and science correspondent, BBC News
Getty Images Woman eating dumplingsGetty Images

The food we eat is putting 11 million of us into an early grave each year, an influential study shows.

The analysis, in the Lancet, found that our daily diet is a bigger killer than smoking and is now involved in one in five deaths around the world.

Salt - whether in bread, soy sauce or processed meals - shortened the highest number of lives.

Researchers say this study is not about obesity, but "poor quality" diets damaging hearts and causing cancer.

So which diets have got it in for me?

The Global Burden of Disease Study is the most authoritative assessment of how people are dying in every country in the world.

The latest analysis used estimates of countries' eating habits to pin down how often diet was shortening lives.

The dangerous diets were those containing:

  1. Too much salt - three million deaths
  2. Too few whole grains - three million deaths
  3. Too little fruit - two million deaths

Low levels of nuts, seeds, vegetables, omega-3 from seafood and fibre were the other major killers.

"We find that diet is one of the dominant drivers of health around the world, it's really quite profound," Prof Christopher Murray, the director of the Institute for Health Metrics and Evaluation at the University of Washington told the BBC.

How is this killing people?

About 10 million out of the 11 million diet-related deaths were because of cardiovascular disease and that explains why salt is such a problem.

Too much salt raises blood pressure and that in turn raises the risk of heart attacks and strokes.

Getty Images Fish and chipsGetty Images
Salt is popular with fish and chips

Salt can also have a direct effect on the heart and blood vessels, leading to heart failure when the organ does not work effectively.

Whole grains, fruit and vegetables have the opposite effect - they are "cardioprotective" and lower the risk of heart problems.

Cancers and type 2 diabetes made up the rest of the diet-related deaths.

How far is the world off a perfect diet?

No country is perfect and each favours some part of a healthy diet more than others, but this is how far the world is from an optimal diet.

Graphic showing Recommended and consumed amounts
Presentational white space

Nuts and seeds again?

The healthy foods missing from the most diets around the world were nuts and seeds, according to the study.

Eager readers will have noticed they featured heavily in the planetary health diet, unveiled in January, to save lives, save the planet and feed 10 billion people.

So why don't we munch them?

Prof Nita Forouhi, from the University of Cambridge, said: "The perception is they are little packs of energy that will make you fat, whereas they are packed full of good fats.

"And most people don't see them as mainstream food; and the other issue is cost."

Getty Images NutsGetty Images
Nuts - they are not just for squirrels.

I thought meat and sugar were the bad guys?

The huge fat versus sugar debate and the link between red and processed meats with cancer have attracted huge headlines in recent years.

"These can be harmful as we show, but they are much smaller issues than low whole grains, fruit, nuts, seeds and vegetable intake," said Prof Murray.

Although, the study did show too many fizzy drinks were being drunk in every corner of the world.

The researchers say it is time for health campaigns to switch from talking about nutrients like fat and sugar and instead promote healthy foods.

But is a tasty unhealthy diet worth it?

Bad diets are knocking a couple of years off life expectancies around the world, according to the researchers.

But Prof Murray warns this is just the average and says the real question we should be asking is: "Am I going to die in my 50s from a heart attack? Or am I going to have some of the diet-related cancers in my 40s":[]}