Frequent alcohol drinking is associated with lower prevalence of self-reported common cold: a retrospective study
BMC Public Health volume 12, Article number: 987 (2012)
Alcohol intake has been associated with reduced incidence of common cold symptoms in 2 European studies. However, no study has addressed the association between the frequency of alcohol intake and the incidence of common cold. This study aimed to investigate the association between the amount and frequency of alcohol drinking and the retrospective prevalence of common cold in Japanese men.
This retrospective study included men who participated in an annual health examination conducted in Sendai, Japan. The frequency of common cold episodes in the previous year was self-reported. The weekly frequency and amount of alcohol consumed, as well as the type of alcoholic drink, were reported by a brief-type self-administered diet history questionnaire. Logistic regression models were used to analyze the association between the amount and frequency of alcohol intake and the retrospective prevalence of common cold.
Among 899 men, 83.4% of the subjects reported drinking alcohol, and 55.4% of the subjects reported having experienced at least one episode of common cold in the previous year. Compared with non-drinkers, the adjusted odds ratios (ORs) with 95% confidence intervals (CIs) for having had 1 or more episodes of common cold during the past year across categories of alcohol intake frequency of 3 or less, 4–6, and 7 days/week were 0.827 (0.541–1.266), 0.703 (0.439–1.124), and 0.621 (0.400–0.965), respectively (P for trend = 0.025); the adjusted ORs with 95% CIs for having had of 2 or more episodes of common cold across the same categories were 0.642 (0.395–1.045), 0.557 (0.319–0.973), and 0.461 (0.270–0.787), respectively (P for trend = 0.006). Compared with subjects who consumed 11.5–35.8 g of alcohol per day, the non-drinkers were significantly more likely to experience 2 or more episodes of common cold (OR, 1.843; 95% CI, 1.115–3.047).
The frequency, not the amount, of alcohol intake was significantly related to lower prevalence of self-reported common cold episodes in Japanese men.
A common cold is one of the most frequently occurring illnesses in humans. According to a survey conducted in the United States (U.S.) , the estimated average number of common cold episodes per adult per year was 2.5. The common cold is not harmful in most cases, and people recover within a few days; however, those who suffer from chronic respiratory diseases, such as asthma  or chronic obstructive pulmonary disease (COPD) , have difficulties controlling their symptoms after catching a cold. Furthermore, common cold causes huge economic burden. It has been estimated that the direct cost of common cold amounts to approximately $17 billion per year . In addition, respiratory symptoms are the major causes for sickness absence among workers , and common cold impacts on working productivity, resulting in average of 8.7 lost work hours per each common cold experienced by a working adult . Therefore, it is important to seek for effective measures or life style that may potentially reduce common cold incidence, as well as to seek for potential risk factors.
According to an experimental study by Cohen et al., alcohol intake contributed to the reduction in the risk of a common cold among non-smokers . Takkouche et al. surveyed the relationship between the incidence of common cold and alcohol intake in a prospective cohort study and concluded that as the amount of wine intake, not total alcohol, increased, the relative risk of having a common cold significantly decreased . It is, however, unclear whether alcohol or other components in wine had a preventive effect on common cold.
The amount and types of alcohol intake vary in different countries. The average amount of alcohol intake per drinker in the United Kingdom (U.K.) and Spain, where the above mentioned 2 studies were conducted, is more than 1.5 times higher than that in Japan . In addition, in these countries, wine and beer are the most frequently consumed beverage types . On the other hand, the Japanese consume mainly beer and Japanese spirits [8, 9]. If alcohol per se has a potential role in reducing common cold incidence, the risk reduction may not depend upon the type of alcoholic drinks but on the amount or the frequency of alcohol intake.
To date, no study has addressed the association between the prevalence of common cold and alcohol intake in the Japanese population. Therefore, the aim of this research was to investigate whether there was a correlation between the amount and frequency of alcohol intake and the retrospective prevalence of self-reported common cold in Japanese men.
The study was based on data from the Oroshisho longitudinal study (from August 2008 to August 2011) composed of a dynamic cohort of adult employees working at the Sendai Oroshisho Center, which is one group (over 120 enterprises) of small and medium enterprises in Sendai, northern Japan. The survey included the results of annual health examinations and additional questionnaires and assessments. The details of the study have been described previously [10–13]. Data from the second year of the cohort study were used for this analysis, because the information on common cold was not collected at baseline.
A total of 1263 men and women received health examinations. Of them, 1215 agreed to participate in this survey and provided written consent forms for their data to be analyzed (response rate = 96.2%). However, because of significant gender differences in the amount and frequency of alcohol intake (p < 0.001) and the insufficient number of female participants for logistic analysis, females (n = 282) were excluded from the final analysis. Males with missing data were also excluded (n = 34), resulting in a total of 899 subjects for the present analyses. The study protocol was approved by the Institutional Review Board of the Tohoku University Graduate School of Medicine.
Participants were asked how many times they had common cold in the previous year, and to select one of the following three options; 1) none, 2) once, and 3) twice or more. History of influenza was excluded from the definition of common cold. Definitions of common cold for analyses were whether or not participants experienced 1) 1 or more episodes of common cold and 2) 2 or more episodes of common cold.
The frequency of alcohol intake per week was estimated based on the data collected from a brief-type self-administered diet history questionnaire (BDHQ). The BDHQ assesses the dietary habits of the previous month, and the participants are required to provide the average frequency of each food intake per week . For assessment of alcohol intake, the participants checked 1 of the following 9 frequency categories: never, less than once, and ranging from “1 day per week” to “7 days per week.” For analyses, drinking frequency was categorized into 4 groups: 0, ≤3, 4–6, and 7 days/week. In addition, average numbers of the following types of 5 alcoholic beverages per session were considered: Japanese sake, beer, Japanese spirits, spirits, and wine. From these data, the average estimated amount of pure alcohol intake per day was calculated . Then, the amount of alcohol was categorized into non-drinkers and tertiles.
Assessment of other variables
Information on age, sex, occupation, educational level, and smoking status was collected using questionnaires in addition to conventional annual health examinations. Based on occupation, a participant was categorized as an office worker or non-office worker. Office workers are employees who work in an office, especially those engaged in clerical or administrative work. Non-office workers include those working as salesmen, or those engaged in jobs that require physical labors such as in manufacture or in carrier business. Educational level was categorized on the basis of the duration of education: greater than 12 years or less. The participants chose their smoking status from non-smoker, ex-smoker, and current smoker. Metabolic syndrome (MetS) was defined as the presence of 3 or more of the following 5 risk components: 1) waist circumstance modified for Japanese as ≥85 cm, 2) average casual blood pressure ≥130/85 mmHg and/or currently taking anti-hypertensive medication, 3) triglycerides ≥150 mg/dL and/or currently taking lipid-lowering medication, 4) high-density lipoprotein cholesterol <40mg/dL and/or currently taking drug treatment for reduced HDL-cholesterol, and 5) fasting glucose ≥100 mg/dL and/or currently taking oral anti-diabetic medication . Body mass index (BMI) was calculated as weight/height2 (kg/m2). Average sleep duration per day was categorized into 3 groups: <7, 7–8, and ≥8 hours. Weekly physical activity (PA) level was calculated using the International Physical Activity Questionnaire (IPAQ) . PA level was determined as daily activity of less or more than 10 minutes. Daily intakes of calories (kcal/day), vitamin C (mg/day), and zinc (mg/day) were calculated from the BDHQ and were divided into quartiles. The Japanese version of the Self-Rating Depression Scale (SDS) was used to assess depressive symptoms . For analyses, having depressive symptoms was defined as score 45 or more out of 80 points.
In this study, because of the distribution of age and BMI was not normal, the common logarithm was applied to normalize the data before statistical analysis. Logistic regression for categorical variables and analysis of variance for continuous variables were used to assess the difference in basic characteristics according to the categorized amount and frequency of alcohol intake. Logistic regression models were also used to analyze the association between the amount and frequency of alcohol intake and the retrospective prevalence of common cold. The odds ratios (ORs) were adjusted with the following potential confounding factors: age, education, occupation, smoking status , BMI, PA , depressive symptoms [21, 22], sleep duration , MetS, calorie intake, vitamin C intake , and zinc intake . For all statistical analyses, the level of significance was determined at P < 0.05. Statistical Package for the Social Sciences (SPSS) software 18.0 (SPSS Japan Inc., Tokyo, Japan) was used for all analyses.
In our study population, 55.4% and 19.9% of the subjects reported having experienced common cold episodes at least once and twice or more during the previous year, respectively. The average amount of alcohol intake was 30.0 g/day with standard deviation of 29.1. Distribution of alcoholic beverages by type was as follows: 12.3% for Japanese sake; 42.9%, beer; 30.6%, Japanese spirits; 8.1%, spirits; and 6.1%, wine. Of the subjects, 16.6% were non-drinkers, and the percentage of those who drank 1 or 2 or more types of alcoholic beverages were 28.9% and 54.5%, respectively. Intake of both beer and Japanese spirits was observed in 63.5% of subjects who drank 2 or more types of alcoholic beverages. The frequency and amount of alcohol intake was significantly positively correlated (r = 0.698, p < 0.001).
The basic characteristics of the participants according to the categorized frequency and amount of alcohol intake are shown in Table 1 and Table 2, respectively. Compared to the subjects who did not drink, those who consumed alcohol every day or more than 35.8 g/day were more likely to be older, currently smoking, have lower BMI, consume more calories, and sleep 7–8 hours per day. They were less likely to never have smoked, consume less calories, and sleep less than 7 hours. No significant relationship was found between the amount and frequency of alcohol intake and other variables.
Common cold and alcohol
Table 3 presents the association of the frequency of alcohol intake with the retrospective prevalence of common cold. Compared with non-drinkers, the crude ORs (95% confidence interval [CI]) for having had 1 or more episodes of common cold in the previous year across categories of alcohol intake frequency of ≤3, 4–6, and 7 days per week were 0.964 (0.644–1.444), 0.744 (0.476–1.163), and 0.599 (0.400–0.895), respectively (P for trend = 0.002). The association remained present after controlling for potential confounders (P for trend = 0.025). In addition, compared with non-drinkers, the crude ORs (95% CI) for having had 2 or more episodes of common cold in the previous year across the aforementioned categories of alcohol intake frequency were 0.813 (0.513–1.289), 0.682 (0.401–1.162), and 0.543 (0.334–0.884), respectively (P for trend = 0.009). Adjustment for potential confounders resulted in a clearer association, and the adjusted ORs (95% CI) were 0.642 (0.395–1.045), 0.557 (0.319–0.973), and 0.461 (0.270–0.787), respectively (P for trend = 0.006).
Similarly, Table 4 shows the ORs with 95% CI for having had common cold in the previous year based on the amount of alcohol intake. In comparison with the drinkers in the second tertile, the non-drinkers were significantly more likely to experience 2 or more episodes of common cold (OR, 1.843; 95% CI, 1.115–3.047), but the OR values for drinkers in the first and third tertiles were neither smaller nor larger. There was no association between the amount of alcohol and the occurrence of 1 or more episodes of common cold. Adjustment for potential confounders did not change the association between the amount of alcohol intake and the retrospective prevalence of common cold.
The study revealed that alcohol intake frequency, not its amount, was associated with the retrospective prevalence of common cold. Moderate alcohol intake has been recognized as a behavior that effectively reduces health risks, such as the development of myocardial infarction  and all-cause mortality . One of the previous studies showed that red wine intake reduced the risk of common cold, while intake of other beverages, such as beer and spirits, did not . Give that the beneficial effect of red wine may be because of its higher antioxidant  and the anti-inflammatory capacity  of polyphenols, the difference seemed to be explained by significantly lower content of polyphenols in beer . In the present study, however, the percentage of the subjects who drank wine was considerably lower than that of the subjects who drank beer or Japanese spirits. Because nearly two thirds of the drinkers consumed more than 2 types of beverages, mainly beer and Japanese spirits, and the numbers of subjects drinking each beverage alone were too small to analyze the independent effect of each type of alcoholic intake. Hence, although a possible effect of other components of beer and Japanese spirits cannot be excluded, alcohol itself may have a beneficial effect on reducing the incidence of common cold.
The associations between the retrospective prevalence and the amount and frequency of alcohol intake were stronger in subjects who had 2 or more episodes of common cold than those who experienced 1 or more episodes. Frequent incidence of common cold may be a reflection of higher susceptibility to common cold viruses, which, in turn, may be influenced by alcohol intake. Rhinovirus (RV) is one of the most common causative pathogens of common cold . The replication of some types of RV, such as RV14 and RV16, is optimal at lower temperatures (33°C) and attenuated at higher temperatures (37°C) . The average temperature in the upper respiratory tract is 32°C, as compared with 35°C in the sub-segmental bronchi . Thus, airway temperature may be one of the key factors determining the susceptibility to RV infections, as well as the attacks of other temperature-sensitive viruses .
Raising airstream temperature is positively related with increasing blood flow of the mid-trachea . Alcohol intake improves skin , cerebral  and coronary blood flow . Hence, alcohol might increase airway blood flow and temperature. One of the mechanisms by which alcohol intake may increase airway temperature could be associated with nitric oxide (NO), a potent vasodilator  stimulated by ethanol [40–43]. Other factor which may be associated with the increased airway temperature is blood acetaldehyde level, which indirectly causes vasodilation  and increases after alcohol intake, resulting in increase blood flow . The temporary effect of alcohol intake on increasing blood NO concentration is reported to last more than 1 hour and up to several hours [40, 41], and blood acetaldehyde level returns to normal within 4 hours after alcohol intake . Given that increased local blood flow in the upper respiratory tract contributes to protection against viruses, daily drinkers of small amounts of alcohol may have an advantage on viral protection over “weekend” or “occasional” drinkers.
There are possibilities that those who had history of stroke, cardiac disease, angina, or chronic renal failure may avoid or reduce alcohol drinking, and that those who have poorer health conditions may have higher incidence of common cold. In this study, however, only 1.7% of the participants had history of these diseases, and there were no skewed distribution of them across either the amount or the frequency of alcohol intake categories (data not shown). Moreover, in this study, there were no significant associations between the amount and frequency of alcohol intake and general health conditions such as physical activity level, depressive symptoms, and metabolic syndrome. Statistical adjustment for these variables did not affect the association between the retrospective prevalence of common cold and the frequency and amount of alcohol intake. Therefore, it is not likely that poorer health conditions have affected our results. Another possibility is that those who suffer common cold may have avoided drinking. Average incidence of common cold episodes per person in northern Japan is reported to be approximately 4 times per year among Japanese adults . Sick days in a common cold episode commonly last for several days. It is therefore likely that the reduction in the amount or the frequency of alcohol during the sick days may not affect our results.
In an elderly population aged 66 to 79 years, those with depressive symptoms had higher incidence of common cold during a 1-year follow-up period . In addition, previous studies showed that psychological stress was related with the risk of common cold . However, in the current study, examining a slightly younger population, no association between depressive symptoms and retrospective common cold incidence was observed (data not shown); further, no association was found between alcohol intake and depressive symptoms.
A previous experimental study showed that those who sleep over 8 hours a day have lower risk of developing common cold . A higher amount of alcohol intake per day has been associated with longer sleep duration . Although the causality between drinking patterns and sleep duration cannot be completely explained, intake of alcohol as a sleep aid by the Japanese  may be one of its reasons. The association between sleep duration and common cold, however, was not observed in the current study. This may be due to the low number of subjects who slept 8 or more hours per day.
The present study has several limitations. First, the incidence of common cold was self-reported, without its specific diagnostic criteria and identification of viruses. Accordingly, there is a possibility that non-clinically diagnosed common cold was included. Second, recall bias may be involved, as the information was collected retrospectively. Patients with asthma  and COPD  are likely to develop common cold; consequently, those patients may tend to remember their common cold episodes better. However, these data are not available in the current study. Finally, obviously, excessive alcohol intake has negative effects on health and increases mortality [49, 50]. Therefore, the results presented here should be interpreted with caution.
The present study revealed that higher frequency of alcohol intake was associated with lower prevalence of self-reported common cold episodes in Japanese men. In contrast, the amount of alcohol intake was not associated with the retrospective prevalence of self-reported common cold. In order to determine whether a higher frequency of alcohol intake reduces the incidence of common cold, a long-term prospective study or randomized trials are required.
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This work was supported by a Grant-in-Aid under the "Knowledge Cluster Initiative" from the Ministry of Education, Culture, Sports, Science and Technology in Japan. We gratefully acknowledge all the subjects who participated in the annual health examination of the Sendai Oroshisho Center and agreed to be included in the study.
The authors declare that they have no competing interests.
EO, KN, and RN designed the research, and interpreted the data; KN, YK, LG, HM, HG, MC, AO, YC, and RN participated in the acquisition of data; EO performed the statistical analysis, and writing the manuscript; KN, and RN supervised the analysis, and assisted in drafting and revising the manuscript. All authors read and approved the final manuscript.
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Ouchi, E., Niu, K., Kobayashi, Y. et al. Frequent alcohol drinking is associated with lower prevalence of self-reported common cold: a retrospective study. BMC Public Health 12, 987 (2012). https://doi.org/10.1186/1471-2458-12-987
- Dietary history
- Common cold