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"Our analysis found that higher levels of behaviour and emotional problems were associated with a more Western-style way of eating, namely a diet high in takeaway foods, red meat, confectionery, soft drinks, white bread and unrefined cereals," Dr. Oddy said.

"We also showed that these problems were less among teens with a more healthier style of eating, specifically those who ate more fruit and vegetables," she added. "This suggests that if we want to reduce the high rates of mental health problems among young people, then improving their overall diet could be a good place to start."

"We know that since 1985, children and teenagers have been increasing their energy intake by consuming more soft drinks and processed foods. The number of overweight adolescents has doubled and obesity has tripled in that age group. At the same time there have been marked increases in sedentary behaviours such as TV viewing and computer use," she said.