Anna Denny, nutrition scientist at the British Nutrition Foundation, said while it was a "crude" estimate, the study highlighted the growing burden of ill health attributed to food.

BBC: Person eating a burger

Dr Elizabeth Weichselbaum, a nutrition scientist at the British Nutrition Foundation, says meat is an important source of a number of nutrients in our diet, including high quality protein, iron, zinc, selenium, vitamin D and some B vitamins.

BBC: Could vegetarians eat a 'test tube' burger?

"More is not necessarily better...some vitamins and minerals can be toxic in high doses, " particularly the fat-soluble ones which the body stores like Vitamins A, D, E and K, explained Claire Williamson, Nutrition Scientist at the British Nutrition Foundation.

CNN: Vitamin cafes: Japan's latest health injection

Sarah Schenker, a dietician at the British Nutrition Foundation, said it was important for all young women to consume sufficient levels of calcium.

BBC: Calcium vital during pregnancy

In this week's Scrubbing Up, Bridget Benelam from the British Nutrition Foundation says there needs to be clear advice on weight control for pregnant women.

BBC: Fat, pregnant or both?

Sarah Schenker, a dietician for the British Nutrition Foundation, said there was nothing wrong with people drinking three or four cups of coffee a day - provided that they also drank water or other decaffeinated drinks to compensate.

BBC: Caffeine 'reduces productivity'

John Briffa, a doctor specialising in nutrition and author of Escape the Diet Trap, is one of those who sets himself against the likes of the British Dietetic Association and British Nutrition Foundation.

BBC: Atkins and the never-ending battle over carbs

The review, which included 24 studies comprising about 2, 600 people, was published in Nutrition Journal and was conducted by researchers at the Global Neuroscience Initiative Foundation, a small nonprofit organization in Los Angeles dedicated to neurological and mental-health research and awareness.

CNN: Can herbal supplements treat anxiety?