Although high or low (no) meat consumption was associated with elevated or reduced mortality from cardiovascular disease, respectively, few studies have investigated the association between moderate meat consumption and cardiovascular disease. We aimed to evaluate the associations between moderate meat consumption and cardiovascular disease mortality.
We conducted a prospective cohort study of 51 683 Japanese (20 466 men and 31 217 women) aged 40–79 years living in all of Japan (The Japan Collaborative Cohort Study; JACC Study). Consumptions of meat (beef, pork, poultry, liver and processed meat) were assessed via a food frequency questionnaire administrated at baseline survey. Hazard ratios (HRs) of mortality from cardiovascular disease were estimated from Cox proportional hazards regression models according to quintiles of meat consumption after adjustment for potential confounding variables.
During 820 076 person-years of follow-up, we documented 2685 deaths due to total cardiovascular disease including 537 ischemic heart diseases and 1209 strokes. The multivariable HRs (95% confidence interval) for the highest versus lowest quintiles of meat consumption (77.6 versus 10.4 g/day) among men were 0.66 (0.45–0.97) for ischemic heart disease, 1.10 (0.84–1.43) for stroke and 1.00 (0.84–1.20) for total cardiovascular disease. The corresponding HRs (59.9 versus 7.5 g/day) among women were 1.22 (0.81–1.83), 0.91 (0.70–1.19) and 1.07 (0.90–1.28). The associations were similar when the consumptions of red meat, poultry, processed meat and liver were examined separately.
Moderate meat consumption, up to ∼100 g/day, was not associated with increased mortality from ischemic heart disease, stroke or total cardiovascular disease among either gender.
Meat is a major protein source for humans.1 Unlike fish or beans, however, meat in particular red or processed meat is often considered to be unhealthy because of the fact that it is a major source of saturated fatty acid (a reported risk factor for ischemic heart disease in Western countries).2, 3, 4 Several cohort studies have reported an association between high consumption of meat (which is two to three more times likely in Westerners but not in Japanese) in particular red or processed meat and risk of ischemic heart disease5, 6, 7 and stroke,8, 9 while one Japanese study showed no association between meat consumption and stroke mortality.10 The evidence on low (no) meat consumption and cardiovascular disease came from studies of vegetarians,11, 12, 13, 14, 15 although their diet and lifestyles may differ in many ways to that of non-vegetarians. Studies of non-vegetarians or general populations are necessary to evaluate an effect of low-to-moderate meat consumption on cardiovascular disease, but no studies have examined this issue. In recent decades, the average meat consumption among Japanese increased gradually during the 1990s, and stabilized thereafter (64.2 g/day for total meat in 1975, 82.3 g/day in 1995 and 82.6 g/day in 2007).1 However, meat consumption among Japanese remains much lower than that among people from Western countries (179.3 g/day for total meat).16
In this paper, we examined the association between moderate meat consumption and mortality from cardiovascular disease in a large prospective study of Japanese men and women.
Subjects and methods
The Japan Collaborative Cohort (JACC) Study is a population-based study of 110 792 persons (46 465 men and 64 327 women) aged 40–79 years during the baseline period (1988–1990), enrolled from 45 communities across Japan. The sampling and protocols of the JACC Study have been described previously.17 Participants replied to self-administered questionnaires about their lifestyles and medical histories such as cardiovascular disease and cancer.18 We excluded persons who had a history of heart disease, stroke or cancer at the baseline survey (n=5864), or participants with a missing response to more than four items on the food frequency questionnaire (FFQ; described below (n=46 198)).19 Furthermore, participants with one or more item missing among five meat items listed on the dietary questionnaire were excluded (n=7047). In addition, we obtained the data of serum total cholesterol levels at municipal health screening examinations from the subsamples of 5800 men and 11 291 women.
As a result, we included 20 466 men and 31 217 women who provided complete information regarding their dietary information. Written or explicitly verbal informed consent was obtained before their questionnaires were completed. In several communities, informed consent was obtained from community leaders on behalf of the individual participants (a common practice for informed consent in Japan at that time). The JACC Study protocol was approved by the Medical Ethical Committees of the Nagoya University School of Medicine, University of Tsukuba and Osaka University.
In each community, investigators conducted a systematic review of death certificates. In Japan, the registration of residence and death is a legal requirement, so it is assumed that this practice is upheld. The participants moved out from their original community were treated as censored cases, for whom the dates of moving out were obtained from the registration database. Follow-up was conducted through to the end of 2008, except for four communities in which the follow-up had ended in 1999, and another four communities for which it had ended in 2003. The median follow-up period was 18.4 years. We used the underlying cause of death coded by the International Statistical Classification of Diseases and Related Health Problems—10th Revision (ICD-10) to identify mortality end points: I20–I25 for ischemic heart disease, I60–I69 for stroke and I01–I99 for total cardiovascular disease.
Consumption of meat
Dietary assessment was evaluated by the FFQ. The FFQ included 33 foods, including 5 meat items: beef, pork, poultry, liver and processed meat. Liver item was considered as meat in this study because its protein and fat contents are similar to lean meat. Five choices were presented for each item with regard to consumption habits: rarely, 1–2 days a month, 1–2 days a week, 3–4 days a week and almost daily. The portion size per day was estimated by a validation study for FFQ among 85 participants. We assigned portion size as 36 g for beef, 41 g for pork, 43 g for poultry, 22 g for processed meat and 53 g for liver.19 In addition, we multiplied the portion size by 1.3 for men for the following two reasons. First, the portion size estimated from the validation study was primarily for women, because the majority of participants (77 out of 85) in the validation study were women. Second, average meat consumption was 1.3 times higher among men than women according to the National Nutrition Survey in 1990.20 We calculated consumption of meat (g/day) from average daily frequencies and portion sizes. On the basis of the Japan Food Table (Fifth Revised and Enlarged Edition), we calculated the intake of total energy from frequency and portion size of each food.19
The reproducibility of this FFQ was confirmed by comparing two questionnaires administered 1 year apart in the validation study.19 The Spearman correlation coefficients were 0.59 for beef, 0.44 for pork, 0.53 for poultry, 0.67 for processed meat and 0.71 for liver. Further, the validity of dietary data was confirmed by comparing the data from the questionnaire with those from four 3-day dietary records, collected approximately 3–4 months apart.19 The Spearman correlation coefficients were 0.49 for beef, 0.37 for pork, 0.44 for poultry, 0.63 for processed meat and 0.20 for liver. The sex-specific mean values (standard deviations) of total meat consumption were 75.9 g (37.1) among men and 55.8 g (24.7) among women for dietary record, and 37.8 g (26.6) among men and 29.8 g (20.8) among women for FFQ.
Age-adjusted means and proportions of selected cardiovascular risk factors and foods were calculated according to quintiles of consumptions of total meat, red meat (beef and pork), poultry, processed meat and liver. Foods were adjusted for energy by the residual method.21 For each participant, we calculated the person-years of follow-up from baseline to the first end point: death, moving from the community or the end of 2008. The mortality rates of each outcome were calculated according to quintiles of meat consumption. Gender-specific hazard ratios with 95% confidence intervals (CIs) were calculated after adjustments for age, and other potential confounding factors using Cox proportional hazards regression models. The statistical testing for linear trends across quintiles of meat consumption was performed by using a median value of each quintile. The confounding factors included body mass index (BMI; gender-specific quintiles), history of hypertension and diabetes mellitus (yes or no), smoking status (never, former, current smoker of 1–19 or ⩾20 cigarettes/day),22 alcohol intake (never, former drinker and current drinker of ethanol at 1–22, 23–45, 46–68 or ⩾69 g/day), perceived mental stress (low, medium or high),23 walking time (rarely, 30, 30–60 or more than 60 min/day),24 sports participation time (rarely, 1–2, 3–4 or more than 5 h/week),24 education levels (age of completed education of <13, 13–15, 16–18 or ⩾19 years), total energy (gender-specific quintiles) and energy-adjusted food (rice, fish, soy, vegetable and fruit) intake (gender-specific quintiles). The self-reported weight and height figures were obtained from the baseline questionnaire. We analyzed this data using SAS version 9.1.3 Service Pack 4 (SAS Institute, Cary, NC, USA). All probability values for statistical tests were two-tailed, and values of P<0.05 were considered as statistically significant.
During 820 076 person-years of follow-up for 51 683 persons (20 466 in men and 31 217 in women), we documented 537 deaths (301 in men and 236 in women) due to ischemic heart disease, 1209 (589 in men and 620 in women) due to stroke and 2685 (1317 in men and 1368 in women) total cardiovascular deaths.
At baseline, median consumption of total meat was 33.7 g/day for men and 27.0 g/day for women. According to quintiles of energy-adjusted total meat consumption, history of diabetes mellitus was positively associated with total meat consumption. BMI, ethanol intake, blood pressure and history of hypertension were inversely associated with total meat consumption (Table 1). Similar trends were observed according to quintiles of red meat consumption and quintiles of poultry, processed meat and liver consumptions (not shown in table). In the subsample of 5800 men and 11 291 women, meat consumption was not associated with serum total cholesterol levels. For men, there were no associations between total meat consumption and age-adjusted mortality from stroke or total cardiovascular disease, although there was an inverse trend with mortality from ischemic heart disease (Table 2). After adjustment for cardiovascular risk factors and selected food intakes, the inverse association with mortality from ischemic heart disease remained statistically significant. The multivariable hazard ratios (95% CI) of mortality from ischemic heart disease for the highest versus lowest quintiles of total meat consumption was 0.66 ((0.45–0.97); P-trend=0.015). For women, total meat consumption was not associated with mortality from ischemic heart disease or total cardiovascular disease in either age-adjusted or multivariable models. Although there was an inverse trend with mortality from stroke in age-adjusted model, the association was no longer statistically significant in multivariable model (Table 2).
The inverse association with ischemic heart disease was similarly observed for red and processed meat consumption among men, while no association for any subtype of meat consumption among women (Table 3).
Stratified by BMI (less and more than 25 kg/m2), these associations did not alter except for overweight women (Table 4). Among overweight women, in which mean BMI was 27.1 kg/m2, the multivariable hazard ratio (95% CI) of mortality from ischemic heart disease for highest versus lowest quintiles of total meat consumption was 2.04 ((0.98–4.26); P-trend=0.040). The associations between total meat consumption and mortality from stroke or total cardiovascular disease did not vary according to the BMI subgroup among men and women.
The inverse association with ischemic heart disease was not observed for any meat subtype among overweight men, although it was observed for processed meat among non-overweight men (Supplementary Table 1). For women, the positive trend was observed for liver consumption among the overweighted, while no association for any meat subtype was shown among the non-overweighted women (Supplementary Table 2).
To examine a potential reverse causation for meat consumption and mortality from cardiovascular disease, we analyzed the data by excluding early deaths. When deaths occurring 1–8 years from the baseline (the middle of the follow-up period) were excluded, the associations between total meat consumption and mortality from ischemic heart disease did not change substantially. For example, after the exclusion of deaths within 8 years from the baseline, the multivariable hazard ratios (95% CI) of ischemic heart disease mortality for highest versus lowest quintiles of total meat consumption were 0.69 ((0.44–1.09); P-trend=0.058), among men, and 1.19 ((0.75–1.90); P-trend=0.57), among women. The associations between red meat, processed meat, poultry or liver with mortality from ischemic heart disease did not change by excluding early deaths.
In this large, community-based prospective cohort study, we observed that consumption of total meat was not associated with increased risk of mortality from stroke and total cardiovascular disease. Persons with higher meat consumptions comparing to those with the lowest consumption of total meat, red meat and processed meat were associated with lower risk of mortality from ischemic heart disease for men, while no associations were found for women. Among overweight women (BMI ⩾25 kg/m2), however, the highest quintile of meat consumption tended to be associated with the elevated risk.
Japanese meat consumption increased from 64.2 g/day in 1975 to 82.3 g/day in 1995, stabilizing at 82.6 g/day in 2007.1 Age-adjusted mortality rates from ischemic heart disease declined from 46.3 per 100 000 in 1990 to 38.7 per 100 000 in 2007 for men, and from 25.6 per 100 000 to 17.0 per 100 000 for women.25 This paradoxical trend in mortality from ischemic heart disease was probably due to the improvement of other risk factors, such as a substantial reduction of blood pressure levels for both men and women, and a decline in the proportion of male smoking. In this study, meat consumption was inversely associated with blood pressure levels and smoking, suggesting that Japanese with moderate meat consumption had a beneficial profile of these cardiovascular risk factors.
The meta-analysis of 20 studies (1218 380 individuals at risk and 23 889 coronary heart diseases) showed that processed meat, but not red meat, was associated with higher risk of coronary heart disease.7 The overall relative risks (95% CI) for coronary heart disease were 1.42 (1.07–1.89) per 50 g serving of processed meat per day and 1.00 (0.81–1.23) per 100 g serving of red meat per day.7 However, as far as moderate meat consumption (up to 100 g/day), previous studies of Americans and Europeans revealed no excess risks of stroke,8, 9 ischemic heart disease26 and total cardiovascular disease.5
We observed the potential excess risk of ischemic heart disease associated with meat consumption among overweight women (mean BMI=27.2 kg/m2). Our finding is constant with a cohort study of Americans women (BMI=26 kg/m2), which showed a significant association between meat consumption and risk of ischemic heart disease.26
We excluded deaths that occurred within 1–8 years from the baseline in order to reduce the potential bias of preexisting illness and disease (such as dyslipidemia, diabetes mellitus and hypertension), which may have lowered individual's meat consumptions due to a belief that meat may be harmful to their health. However, after the exclusion of early deaths within 8 years of the baseline, the association did not change substantially, suggesting that the reverse causation is unlikely.
Several mechanisms were considered about adverse effects of meat consumption, because of high amount of heme iron, saturated fat and for processed meat, sodium. Heme iron increases risks of carotid atherosclerosis and type 2 diabetes, probably through the form action of hydroxyl radicals.27, 28 Oxidative stress induces insulin resistance through inhibition of normal phosphorylation of insulin receptor substrate proteins, and reduction of bioavailability of nitric oxide as a regulator of endothelial function through the peroxynitrite formation.29 High sodium intake increases blood pressure levels.30, 31 High intake of saturated fat rich in meat increases total and low-density lipoprotein cholesterol levels.32 Taken together, all of these effects may contribute to increase the risk of ischemic heart disease. However, in this study, total meat consumption was not associated with serum total cholesterol levels. Therefore, the positive association between total meat consumption and mortality from ischemic heart disease among the overweighted women was not explained by serum total cholesterol.
In addition, the mechanisms for the no positive association which observed between meat consumption and cardiovascular disease mortality observed in the present study are uncertain, but a potential effect of amino acids can be considered. Several amino acids such as branched-chain amino acids, L-arginine, tryptophan and tyrosine are richer in animal foods but poor in rice. Branched-chain amino acids promote the anabolic effect of cardiac protein, which may protect heart from ischemic damage.33 L-arginine, a substrate for nitric oxide, produces an immediate reduction in systolic and diastolic blood pressures in humans.34 Tryptophan and tyrosine have an antihypertensive effect in rats due to serotonin formation in the central nervous system.35, 36 However, we need further investigations whether these bioactivities affect risk of cardiovascular disease through moderate meat consumption.
The strengths of our study include its large cohort size, which provided us with strong statistical power, and a single study with a standardized protocol. The Japanese population's mean levels of total meat consumption were approximately half to one-third of those of Western people.16 Traditional Japanese diet consists rice, miso soup and three dishes. One of the dishes is meat or fish, and the other two dishes are usually vegetables. In addition, the common cooking way of meat is boiling or stir-frying with vegetables rather than grilling like barbecue, the portion size of meat is generally small. Therefore, our study could effectively examine the relationship between moderate meat consumption and mortality from cardiovascular disease.
There were also several limitations in this study. First, for people who selected the highest category of meat consumption frequency (namely, almost daily), we could not estimate how many times they ate meat daily. This may have led to the underestimation of meat consumption. The estimated median meat consumption in this study (33.7 g/day for men and 27.0 g/day for women) was less than half that estimated from dietary records in the validation study (75.9 g/day among men and 55.8 g/day among women).19 Although the amount of meat consumed could be underestimated, the ranking of meat consumption was unlikely to change in this study. Second, a number of participants were excluded because they did not respond sufficiently to the FFQ. The non-respondents were older (58.8 years compared to 55.9 years), highly educated (high school or lower education achieved: 6% compared to 13%) and male (44 versus 40%), compared with respondents, although there were small differences in other baseline characteristics. Thus, a potential selection bias may be small. Finally, we cannot negate the possibility of residual confounding by other unexamined lifestyles or socioeconomic status.
In conclusion, moderate meat consumption, up to ∼100 g/day, was not associated with increased mortality from ischemic heart disease, stroke or total cardiovascular disease among Japanese men and women. The potential excess risk of ischemic heart disease associated with meat consumption among overweight women needs further investigation.
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This study was supported by grants-in-aid for scientific research from the Ministry of Education, Science, Sports and Culture of Japan (Monbusho), Japanese Ministry of Education, Culture, Sports, Science, and Technology (Monbu-kagakusho); grant numbers: 61010076, 62010074, 63010074, 1010068, 2151065, 3151064, 4151063, 5151069, 6279102, 11181101, 17015022, 18014011, 14207019 and 19390174 to the JACC Study. We express our sincere appreciation to Dr Kunio Aoki, Professor Emeritus, Nagoya University School of Medicine and a former chairperson of the JACC Study, to Dr Haruo Sugano, the former director of the Cancer Institute, Tokyo, who greatly contributed to the initiation of the JACC Study, and to Dr Yoshiyuki Ohno, Professor Emeritus, Nagoya University School of Medicine, who was also a former chairperson of the study. We also thank Dr Tomoyuki Kitagawa of the Cancer Institute of the Japanese Foundation for Cancer Research and a former chairperson of Grant-in-Aid for Scientific Research on Priority Area ‘Cancer’, for his valuable support of this study. All members of the JACC Study are listed in http://www.aichi-medu.ac.jp/jacc/member.html.
The authors declare no conflict of interest.
Contributors: MN, HI, CD and AT designed the research; HI, KY and AT conducted the research; MN analyzed the data; MN and HI wrote the paper; KY, CD and AT made critical revision and HI had primary responsibility for the final content. All authors read and approved the final manuscript.
Supplementary Information accompanies the paper on European Journal of Clinical Nutrition website
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Nagao, M., Iso, H., Yamagishi, K. et al. Meat consumption in relation to mortality from cardiovascular disease among Japanese men and women. Eur J Clin Nutr 66, 687–693 (2012). https://doi.org/10.1038/ejcn.2012.6
- cardiovascular diseases
- ischemic heart disease
- prospective study
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