Jan. 16, 2013 Eating three or more weekly servings of fast food is linked to the severity of allergic asthma, eczema, and rhinitis among children in the developed world, indicates a large international study published online in the respiratory journal Thorax. <\/p>\n
The findings prompt the authors to suggest that a fast food diet may be contributing to the rise in these conditions, and if proved causal, could have huge implications for public health, given the popularity of these foodstuffs. <\/p>\n
The authors base their findings on data from more than 319,000 13-14 year olds from 107 centres in 51 countries, and more than181,000 six to seven year olds from 64 centres in 31 countries. <\/p>\n
All the participants were involved in the International Study of Asthma and Allergies in Childhood (ISAAC), which is a collaborative research project involving more than 100 countries and nearly two million children, making it the largest study of its kind. <\/p>\n
The teens and the children's parents were formally quizzed on whether they had symptoms of asthma (wheeze); rhinoconjunctivitis (which produces a runny or blocked nose accompanied by itchy and watery eyes); and eczema; and their weekly diet. <\/p>\n
Questions focused particularly on the severity of symptoms over the preceding 12 months -- including frequency and interference with daily life and\/or sleep patterns -- and certain types of food already linked to protective or damaging effects on health <\/p>\n
These included meat, fish, fruits and vegetables, pulses, cereals, bread and pasta, rice, butter, margarine, nuts, potatoes, milk, eggs, and fast food\/burgers. Consumption was categorised as never; occasionally; once or twice a week; and three or more times a week. <\/p>\n
After taking account of factors likely to influence the results, the analysis showed that fast food was the only food type to show the same associations across both age groups, prompting the authors to suggest that \"such consistency adds some weight to the possible causality of the relationship.\" <\/p>\n
It was associated with current and severe symptoms of all three conditions among the teens -- across all centres in the participating countries, irrespective of gender or levels of affluence. <\/p>\n
The pattern among children was less clear-cut, but a fast food diet was still associated with symptoms across all centres -- except for current eczema -- and poorer countries -- except for current and severe asthma. <\/p>\n
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