Millions of adults die every year from bugs and toxins in what they eat, according to new World Health Organization data that shows food-borne diseases are far more deadly than the U.N. agency previously estimated.

The research faults unsafe food for 1.2 million deaths per year in people over the age of five in Southeast Asia and Africa -- three times more adult deaths than the Geneva-based WHO had thought occurred in the whole world.

"It is a picture that we have never had before," WHO Food Safety Director Jorgen Schlundt said in an interview. "We now have documentation of a significant burden outside the less than five group, that is major new information."

Ailments linked to contaminated food and water have long been seen as a major threat to young children, who can dehydrate quickly. But the Danish veterinarian and microbiologist said the risks to older populations had been grossly underestimated.

Older children and the elderly are especially vulnerable to severe illness from major food- and water-borne diseases such as salmonella, listeria, E. coli, Hepatitis A and cholera.

Food safety experts are now seeking to measure the burden of such afflictions in people over the age of five in the Arab world, Latin America and elsewhere in Asia including China.

And already, Schlundt said, health officials are recognizing the need to confront the most dangerous types of contamination in their industrial regulations and trade standards.

"Literally millions are dying every year and we know that a lot of these could be prevented," he told Reuters. "There is a realization that instead of doing what we did in the past, in the future we should really focus on where the problems are."

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