Regular consumption of soy products could decrease the risk of lung disease and breathlessness, according to a new respiratory health study from Japan.
Published in the Journal Respiratory Research, the new study
examined nearly 300 patients diagnosed with lung disease, and
measured their reported soy food intake. “Soy consumption was
found to be positively correlated with lung function and inversely associated with the risk of chronic obstructive pulmonary disease (COPD). The epidemiological evidence also indicated an inverse association between total soy intake and breathlessness,” wrote the researchers from Japan and Australia.
The study was conducted on 278 Japanese patients aged 50-75,
who had been diagnosed with COPD within the past four years.
Another 340 participants recruited from the general Japanese
population were used as a control group. All participants were
tested for respiratory function. Food consumption and lifestyle
characteristics were determined based on structured questionnaires.
The researchers identified the self-reporting of dietary intake as a limitation to their study, but said that they also included individual interviews with relatives in order to increase response rate and improve the accurac y of answers. They also said all interviews were conducted by the same investigator to eliminate inter-interviewer bias.
Participants were asked specifically about their soy food
consumption for the five years prior to the interview date.
For the purposes of the study, soy foods includeded tofu, natto, bean sprouts, and soy milk. Other variables measured were age, gender, body mass index, education level, physical activity, smoking status, and dietary intake of fruit, vegetables, fish, red meat and chicken.
Overall, the researchers found that those participants diagnosed with COPD had significantly lower soy intake than controls. Researcher then examined the relationship with lung function, and found that this was positively correlated with total soy consumption.
“A significant reduction in COPD risk was evident for the highest versus lowest quartile of daily total intake of soybean products,” wrote the researchers.
The observed benefits, consistent with findings from previous
studies, could be a result of the anti-inflammatory benefits of
soyfoods, they said, but added that more research is needed
to understand the underlying biological mechanism.
“The present case-control s tudy has suggested an inverse
association between soy products and COPD risk for Japanese
adults,” concluded the researchers.
“More research and/or replications are required to ascertain whether the observed findings can be generalized to other populations, before incorporating these foods into dietary guidelines so as to encourage consumption.”
“Besides experimental studies, long-term prospective cohort studies collecting detailed dietary exposure information are recommended to provide epidemiological evidence on both morbidity and mortality due to COPD.”
Source: Soy consumption and risk of COPD and respiratory symptoms: a case-control study in Japan Respiratory Research 2009,