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The Consumption of Milk and Dairy Foods and the Incidence of Vascular Disease and Diabetes: An Overview of the Evidence


The health effects of milk and dairy food consumption would best be determined in randomised controlled trials. No adequately powered trial has been reported and none is likely because of the numbers required. The best evidence comes, therefore, from prospective cohort studies with disease events and death as outcomes. Medline was searched for prospective studies of dairy food consumption and incident vascular disease and Type 2 diabetes, based on representative population samples. Reports in which evaluation was in incident disease or death were selected. Meta-analyses of the adjusted estimates of relative risk for disease outcomes in these reports were conducted. Relevant case–control retrospective studies were also identified and the results are summarised in this article. Meta-analyses suggest a reduction in risk in the subjects with the highest dairy consumption relative to those with the lowest intake: 0.87 (0.77, 0.98) for all-cause deaths, 0.92 (0.80, 0.99) for ischaemic heart disease, 0.79 (0.68, 0.91) for stroke and 0.85 (0.75, 0.96) for incident diabetes. The number of cohort studies which give evidence on individual dairy food items is very small, but, again, there is no convincing evidence of harm from consumption of the separate food items. In conclusion, there appears to be an enormous mis-match between the evidence from long-term prospective studies and perceptions of harm from the consumption of dairy food items.


Milk and dairy foods contain saturated fats, and their consumption often leads to a rise in plasma cholesterol level. This, together with the belief that milk is ‘fattening’, appears to have led to the widespread conviction that milk and dairy foods are a factor in obesity and in heart disease, and that their consumption should be limited.

At least ten hypotheses have been defined in attempts to explain the supposed harm from milk and dairy consumption [1]. The mechanism most frequently quoted is, undoubtedly, a rise in plasma cholesterol concentration following the ingestion of milk or a dairy food item. The drawing of conclusions about milk from its effect upon a single ‘intermediate’ variate, such as cholesterol level, is, however, quite unreasonable, as it ignores the fact that milk, being a complex food with a host of nutrients, is likely to affect many mechanisms relevant to the development of vascular and other diseases. The only valid basis for conclusions about a food item and health or survival comes from long-term studies of the consumption of that food and the incidence of disease or death.

Archie Cochrane was one of the first to urge that conclusions in clinical practice and in medical research are evidence-based, and that the evidence considered comes from all of the available, bias-free relevant studies [2]. The urgings of Cochrane and others have led to ‘evidence-based medicine’ within the whole field of clinical and public health practice. Alvarez-León et al. [3] have, however, pointed out that statements about the benefits and risks of dairy product consumption appear to be based on selected physio-pathological data, such as relationships with cholesterol level, and not on valid epidemiological evidence, indeed, as Alvarez-León et al. commented: “Public health nutrition should not be unaware of the need for evidence-based conclusions.”

The most convincing evidence on a food item and health would come from randomised controlled trials, but no adequately powered trials of milk or dairy consumption have been reported, nor are any likely to be conducted because of the numbers of participants required and the compliance that would be necessary from each participant. By default, the best evidence on dairy food consumption, health and survival comes, therefore, from long-term cohort studies with disease events and death as the outcomes.

We report the results of a literature search and meta-analyses of prospective cohort studies of milk and dairy food consumption as predictors, and death, vascular disease and diabetes as outcomes. We also summarise evidence from relevant retrospective case–control studies.

Experimental Procedure

As far as possible, the procedures in the review and meta-analyses which we conducted are those outlined by Egger et al. [4] and Moher et al. [5] using the statistical programmes available at

Search Strategy

A number of searches were conducted using Medline, PubMed and ISI Web of Science, and four researchers were involved. Using the search terms for predictors: milk, dairy, dairy products, cheese, butter, cream and yoghurt, together with the terms for outcomes: death, heart disease and stroke, 138 papers were identified and limiting these to ‘adult’ gave 47 papers. The predictors together with the outcome terms diabetes and diabetes mellitus Type 2 gave 330 papers. From these, five papers were selected. Papers which used a composite of foods including dairy items as a predictor were not selected. A further three papers with relevant results, which had not been detected in the electronic searches but which had been identified by the lead author during extensive reading over the past ten and more years, were included.

In the end, a total of 38 reports of cohort studies were selected and used in the analyses presented. Five case–control retrospective studies which gave relevant data are described in what follows, but are not examined by meta-analyses. In an attempt to clarify uncertainties, and/or to obtain further data, letters were sent to 14 authors, but responses were obtained from only a very few.


The results of a test of homogeneity between studies is given for each dairy food, together with estimates of the overall relative risk. Difficulties arose from the fact that the results of individual studies were reported in terms of relative risk, odds ratio or hazard ratio. These three measures of risk are not entirely equivalent. However, in almost all of the studies, the event rate is well below 10% and, in this situation, the odds ratio can be considered as a good approximation for the relative risk [4]. The hazard ratio is a comparison of time-to-event and, so, is not an approximation for the relative risk. However, repeating the summary calculations with and without the studies which reported a hazard ratio produced only a trivial difference in the results.

The summary statistic was calculated using the ‘meta’ command in the Stata statistical software package [4]. This uses an inverse-variance weighting to calculate fixed and random effects summary statistics. The ‘meta’ command was convenient as it calculates the variance using the confidence intervals of the risk estimate. Homogeneity was assessed using the Q statistic, which tests the null hypothesis that the variation between trials is compatible with chance. It follows a Chi-squared distribution with n − 1 degrees of freedom, where n is the number of studies being investigated. In many of our groupings, there was significant heterogeneity. The heterogeneity led to the choice of random effects models for the summary statistics. The adjusted relative risks (RR) given in each individual report were noted, and pooled estimates were obtained from these by weighting the natural logs of each reported RR by the inverse of the variance, as described by Gao et al. [6].

In addition to all of the above, data from relevant retrospective case–control studies are described in the text.


Dairy Foods

Eight long-term cohort studies have reported on all-cause deaths in relation to dairy food consumption (Table 1). Unfortunately, two of the studies [7, 8] do not include sufficient data for inclusion in a meta-analysis. There is no significant heterogeneity between the results for the six studies (P = 0.427) and a meta-analysis suggests a small but significant reduction in total mortality in the subjects with the highest dairy consumption, relative to the risk in the subjects with the lowest consumption (RR) 0.87; 95% confidence limits (0.77, 0.98).

Table 1 Dairy foods and all-cause mortality


Table 2 summarises data from 11 cohort studies of milk consumption and ischaemic heart disease (IHD). Again, two do not include adequate data for inclusion in a meta-analysis. The results of the other nine cohorts show no significant heterogeneity (P = 0.570) and the overall risk of incident heart disease in the subjects with the highest milk intake, relative to those within each cohort with the lowest milk intakes, is 0.92 (0.80, 0.99).

Table 2 Milk and dairy consumption and incident ischaemic heart disease (IHD)

As indicated in a footnote to Table 2, the result reported by Hu et al. [9] for whole milk (1.67; 1.14, 1.90) shows marked heterogeneity with all the other estimates of risk for milk. We have, therefore, used the estimate of Hu et al. [9] for skimmed milk in our meta-analysis. If, however, it is assumed that 20% of women in that cohort had been drinking whole milk and 80% skimmed milk, then an overall estimate of IHD risk in the cohort studied by Hu et al. [9] is 0.96 (0.74, 1.15), and putting this estimate into the meta-analysis gives an overall estimate for milk and heart disease of 0.91 (0.77–1.07). A similar problem arose with estimates derived from the same cohort of the US Nurses Health Study by Sun et al. [10]. They used plasma pentadecanoic acid as a surrogate for dairy fat consumption, though it can also be obtained from beef, lamb and venison. The estimate of risk for heart disease that they obtained is statistically inconsistent with estimates derived from other populations in which the same surrogate approach had been used [11]. It could possibly be that the women within the Nurses’ Cohort who drank whole milk had become so highly selected with reference to a range of health-related behaviours that they may have become unrepresentative of any meaningful population group.

In a report based on 27,529 Adventists, Snowdon [12] states that milk was not related to all-cause mortality, but he gives no data. Likewise, Jacobsen and Stensvold [13] refer to “a large prospective study with more than 17,000 men and women followed for 11.5 years (which) showed an inverse relationship between milk drinking (predominantly full-fat milk) and the risk of cardiovascular death.” One of the authors (BKJ) was contacted and details requested, but these are not now available.

A number of cross-sectional studies have been reported in which the past milk consumption of patients admitted to hospital with a myocardial infarct was compared with the past consumption by control subjects without evidence of vascular disease. This research strategy has uncertainties because only a proportion of patients survive an infarct and are questioned, and because the estimation of milk intake prior to the infarct is dependent upon memory. Four such studies have been reviewed elsewhere [14] and a meta-analysis yielded an overall relative risk of milk consumption and incident heart disease of 0.83 (0.66, 0.99). A further, unusual case–control study of 144 diabetic patients with peripheral vascular disease matched with 288 control diabetic patients reported an odds ratio of 0.71 (0.42, 1.19) for peripheral vascular disease in those who consumed milk more than seven times a week relative to those who took milk twice or less per week [15].

The estimates of risk for milk consumption and stroke incidence in the 11 cohorts summarised in Table 3 show significant heterogeneity, and although the overall estimate of risk is significant (0.78; 0.68, 0.91), this cannot be interpreted with confidence. However, the data on stroke in Table 3 relate, as far as is possible, to ischaemic stroke and in Table 4, reports on haemorrhagic strokes and sub-arachnoid bleeds are summarised. Five studies give evidence on haemorrhagic stroke, and, again, there is significant heterogeneity, but the overall risk in relation to dairy intake is 0.75; (0.60, 0.94). Only three studies give evidence on sub-arachnoid bleeds and, ignoring significant heterogeneity, the overall risk in those with the highest dairy intake is 0.65 (0.32, 1.31).

Table 3 Milk and dairy consumption and incident stroke
Table 4 Dairy foods, haemorrhagic stroke and sub-arachnoid bleeds

Butter and Cheese

Table 5 summarises the data from studies in which butter and cheese consumption were examined as possible predictors of vascular disease. For butter, the literature search identified only five cohort studies with incident vascular disease as the outcome. Only three of these give sufficient data to enable inclusion in a meta-analysis. The results are homogeneous, but the overall relationship between butter consumption and vascular events (0.93; 0.84, 1.02) is not statistically significant. In another early cohort study [16], 832 men were followed for 21 years. There were 267 incident CHD events and the authors commented: ‘butter intake did not predict CHD incidence,’ but no original data are given.

Table 5 Butter, cheese, and vascular disease and death

Several case–control studies of butter and vascular disease have been reported. In one, the previous diets of 106 patients with a myocardial infarct were compared with the diets of 105 controls, and an adjusted odds ratio of an infarct was reported as 2.80 (1.14, 6.85) for ‘butter and margarine’ [17]. In another, the use of butter by 287 women with an acute myocardial infarct was compared with that of 649 control women and an odds ratio in the upper third, adjusted for age alone, of 2.3 was reported [18]. In a study of diabetic patients, 144 with peripheral arterial disease were compared with 288 matched control patients and an odds ratio of 2.06 (1.15. 3.68) reported for the consumption of butter [15].

Evidence on cheese and vascular disease is also limited. Results have been reported from six cohort studies (Table 5), but sufficient data for a meta-analysis are given in only two. A difficulty arises here because, while random effects meta-analysis seems to be appropriate throughout the work in this paper, in the case of the two studies with cheese, there is a massive difference in the numbers of events and, hence, in the power of the two studies, with conclusions in one being based on only 64 vascular events and on 2,702 disease events in the other. It seems reasonable, therefore, for this one dairy item, to use a fixed effects model, thus, weighting the studies appropriately. This gives an overall estimate of risk from cheese of 0.90 (0.79, 1.03).

Other studies on cheese include a follow-up of 27,529 seventh-day Adventists over 20 years, in which it is stated that “…cheese… consumption (was) unrelated to stroke mortality” but no data are given [12]. In a report based on the 85,764 women in the US Nurses Health Study, the authors comment that the inverse association observed for stroke with dairy calcium was not restricted to milk, but was also observed for hard cheese [19], but, again, no data are given. Finally, in a wide-ranging review of studies of cheese consumption, Tholstrup [20] found “no convincing evidence of harm,” and wrote of the ‘neutral’ effect of cheese on coronary heart disease.

A number of studies based on retrospective case–control comparisons examined cheese consumption and vascular disease. A comparison of the past diets of 106 patients with myocardial infarction and 105 control subjects [17] gave an adjusted odds ratio for cheese and yoghurt of 0.42 (0.18–1.03). In another case–control study of 111 myocardial infarction patients and 107 controls [21], an estimated odds ratio in the highest quartile of cheese intake of 0.34 (0.13, 0.91) was reported. In yet other case–control studies, estimates of 0.77 (0.54–1.11) [22] and 1.0 (no CIs stated) [18] were made for cheese consumption. Finally, Ciccarone et al. [15] reported an odds ratio for cheese consumption in 144 diabetic patients with peripheral vascular disease compared with 288 matched control diabetic patients of 0.61 (0.26–1.45).

Other Dairy Foods

Evidence on other individual dairy food items is very sparse indeed. The large ATBS cohort of Finnish male smokers originally enlisted for a randomised trial of antioxidant prophylaxis [23] yielded adjusted odds ratios for the quintile of subjects with the largest intake of cream (0.81; 0.72–0.92 for cerebral infarction and 0.72; 0.52–1.00 for intra-cerebral haemorrhage), yoghurt (1.08; 0.95–1.24 and 1.08; 0.58–1.28) and ice cream (0.92; 0.81–1.03 and 1.21; 0.89–1.63), none of which are significant. In the report on the US Nurses Health Study, Iso et al. [19] commented that the inverse association observed for stroke with dairy calcium was not restricted to milk, but was also shown for yoghurt and for ice cream.

Evidence from cross-sectional retrospective studies of these items comes from Tavani et al. [22], who reported an odds ratio for yoghurt in a case–control study based on 507 patients with an acute myocardial infarction of 0.55 (0.32–0.95). Biong et al. [21] based a study on 111 myocardial infarction patients and 107 controls and estimated an odds ratio in the highest quartile of ice cream of 0.99 (P = 0.21, no CIs stated). Finally, a case–control study of cream consumption in 432 diabetic patients yielded an odds ratio of 2.79 (0.93–8.35) for peripheral vascular disease [15].

Dairy Foods and Diabetes

Elsewhere [24], we have reported a meta-analysis of cross-sectional studies of milk and/or dairy consumption and the metabolic syndrome (RR in the highest consumers of milk and dairy: 0.74; 0.64–0.84). Five studies have now reported on dairy consumption and incident Type 2 diabetes (Table 6). The results of these studies (Table 6) are homogeneous, and the estimated overall relative risk for diabetes is 0.85 (0.75–0.96).

Table 6 Milk and dairy consumption and diabetes


Much has been written on the associations between the consumption of milk and dairy products and individual vascular risk factors, and, in particular, effects on plasma cholesterol level. An evaluation based upon a single risk factor for a disease can, however, be misleading. At the same time as affecting lipid markers of heart disease, the consumption of milk and dairy produce is associated with an increase in the level of high-density lipoprotein cholesterol [25, 26] and with a reduction in blood pressure [27, 28], and, furthermore, milk and dairy food items are likely to have effects upon many other biological mechanisms and disease processes. Even studies which have examined relationships with a cluster of risk factors for disease, such as the metabolic syndrome [24], cannot possibly give a valid estimate of the overall effect of a complex food such as milk on disease incidence.

Most concern appears to focus on milk consumption and heart disease, and the evidence we present on this is substantial. The studies are homogeneous and the meta-analysis of all of the available evidence suggests that there is a small but worthwhile reduction in risk of coronary heart disease (0.92; 0.80, 0.99) in the subjects who drink the most milk. The evidence which we present on milk and the risk of stroke is also substantial and suggests a reduction in both all stroke (0.79; 0.68–0.91) and in haemorrhagic lesions in those with the highest consumption of milk. A reduction in sub-arachnoid haemorrhage was unexpected, as the aetiology of this condition is totally different to that of thrombo-embolic or haemorrhagic stroke, but benefit from a reduction in blood pressure would be common to all of these events.

All-cause mortality also shows a reduction associated with dairy food consumption (0.87; 0.77–0.98). The evidence of a reduction in diabetes is also substantial, the results of the separate studies are homogeneous (P = 0.122) and the risk reduction in the highest consumers of dairy foods is statistically significant (0.85; 0.75–0.96).

The literature on milk and dairy consumption and cancer is extensive. A detailed examination of the evidence is beyond the scope of this review, but it has been reviewed by the World Cancer Research Fund and the American Institute for Cancer Research [29]. The consumption of milk or dairy foods is associated with a significant reduction in colon cancer (the pooled RR from ten cohort studies is 0.78; 0.69–0.88 and for bladder cancer in four cohorts, the RR is 0.82; 0.67–0.99). There may, however, be an increased risk of prostate cancer, the relative risk estimated from eight cohorts being 1.05; 0.98–1.14. No relationship of importance with milk or dairy consumption was reported for any other cancer.

Apart, perhaps, from milk, no firm conclusions can, however, be drawn on the individual dairy food items. In fact, there is an extreme paucity of studies relating to individual dairy food items. We find this quite remarkable, given the strength of the beliefs about the undesirable effects of butter in particular. The disparity between the results on butter from cohort and from retrospective case–control studies is of concern. Thus, the overview of three cohort studies suggests a possible reduction in vascular disease risk (0.93; 0.84–1.02), while two cross-sectional studies suggested an increase and one an increase in peripheral arterial disease from the consumption of butter. This kind of inconsistency between evidence collected prospectively and evidence dependent upon the memory of patients is, however, not unknown in epidemiological research, and, perhaps, the main message of these data relates to the inadequacy of the evidence on butter and the other dairy items, rather than whether or not there is evidence of harm.

Unfortunately, it is not possible to estimate quantitative relationships with disease incidence for the consumption of a dairy item with any confidence. For example, within the studies reporting milk consumption, the quantity defined as ‘high’ varied in the different studies. Most studies used quartiles or quintiles of the distribution of intakes, while others defined milk intake in terms of the number of occasions on which milk or dairy foods were consumed. Nevertheless, several studies defined a ‘high’ intake as the consumption of one pint (568 ml) or more per day [3032], in others two or more ‘glasses’ per day [19, 33], while in a study based on weighed dietary intakes [34], the mean daily consumption of milk in the subjects who showed a reduction in vascular disease and diabetes was a pint (568 ml) or more.

A number of systematic reviews of dairy foods have already been published and are consistent with what we present. Gibson et al. [35] identified 12 cohort studies and, from them, drew the conclusion that their review showed “no consistent findings to support the concept that dairy food consumption is associated with a higher risk of coronary heart disease.” Mente et al. [36] looked at a number of foods, including milk. Their conclusion, based on five cohort studies, was that milk has “no significant association with coronary heart disease” (0.91; 0.73–1.00). Two earlier overview studies by us [14, 31] examined associations with milk, and, although based on smaller numbers of cohorts, the results of both are in close agreement with those which we now report.

There are, of course, serious limitations in the evidence we present. The cohort strategy is powerful, but it still has uncertainties and possible biases. In particular, estimates of risk for one item can be confounded by the effects of dietary and other factors apart from milk and dairy consumption. Then, there are differences in social class, smoking and other factors between subjects who drink milk and those who drink little or none, and some of the studies comment upon these [31, 37]. While all of the estimates upon which we have based our overall meta-analyses have each been adjusted for a number of confounding factors, as listed in the tables (age, social class, smoking, alcohol, activity etc.), residual confounding by unknown factors is still possible. While it is possible that this could possibly explain the observed reductions in vascular disease, diabetes and all-cause mortality, it seems highly unlikely that a true harmful effect of milk/dairy consumption on the diseases considered could have been missed simply because of some important, but as yet unknown, confounding factor(s). It is also possible, but again extremely unlikely, that publication bias has led to studies which showed harm from dairy consumption have been preferentially withheld from publication.

The issue of fat-reduced, skimmed milk and other fat-reduced dairy products remains. Despite the widespread beliefs that whole milk increases the risk of vascular disease, and is ‘fattening’, the appropriate question to ask is: do fat-reduced milks provide any advantage further to the benefits conferred by the consumption of whole dairy foods or milk, or does the removal of fat reduce the benefit of the whole items? Low-fat milks were not widely used in the US until about 1989 and about 2000 in the UK, and a large part of the follow-up periods of most of the cohort studies which we have included in the meta-analyses relate, therefore, to times when the milk and dairy items consumed were the full-fat items. Epidemiological studies are of necessity long term and, therefore, the data which we have summarised and the conclusion we have drawn relate overwhelmingly to whole milk and full-fat dairy items.

Given the promotion of fat-reduced milks by many authorities and the large increase in the consumption of fat-reduced milks and dairy items throughout the Western world, this is an area requiring critical study. A number of reports do give evidence on the incidence of disease events in subjects within the same cohort who drank whole milk and others who drank fat-reduced milk, and we have summarised some of these data elsewhere [14]. However, it is most important to accept that persons who choose to drink fat-reduced milks will almost certainly have adopted other ‘healthy’ behaviours, and these will confound any differences in disease outcome within groups of persons defined by the type of milk consumed. It has to be accepted that these other confounding factors cannot all be known, but they will be responsible for biases which cannot possibly be estimated or allowed for. In the absence of evidence from large long-term randomised trials, the statement of German and Dillard [38] is, therefore, most apposite: “Such hypotheses (about fat-reduced milks) are the basis of sound scientific debate; however they are not the basis of sound public health policy.”

On a priori grounds, milk would be expected to be beneficial to health. Calcium has many biological actions, including a reduction in fat absorption through the forming of soaps in the intestine and the binding of cholesterol and bile acids in the gut [39]. Of greater importance is a reduction of blood pressure by dietary calcium, and in a 6-year study of 2,245 older subjects in the Rotterdam Cohort Study, a 20% reduction in incident hypertension was attributed to dairy food consumption [40]. While calcium, magnesium and potassium are all required to prevent hypertension, dairy products are unique in providing a balanced supply of these elements [3, 41]. This may be why milk appears to have a greater effect on blood pressure than dietary calcium supplements [27]. Furthermore, in addition to the minerals provided by milk, certain peptides released on the digestion of milk proteins may have a beneficial effect on blood pressure by inhibiting the angiotension-1-converting enzyme, thus, modulating endothelial function [42].

Renaud et al. [43] described further effects of dietary calcium on thrombo-embolic mechanisms. They fed butter to rabbits and to half, they also gave high levels of calcium. The calcium led to a reduction in platelet aggregation, and a reduction in the severity of atherosclerosis. However, an examination of extensive platelet-related tests in 1,433 older men in the Caerphilly Cohort Study [44] gave no confirmatory evidence in terms of an association between milk consumption and platelet aggregation to adenosine phosphate (P = 0.41), or stressed template bleeding times (P = 0.91) (unpublished data).

The results of the literature search and meta-analyses presented here are summarised in Table 7 and in Fig. 1. The similarity of the estimates of risk is remarkable and, although conclusions have to be tentative, it seems not unreasonable to conclude that there is no evidence that dairy foods as a total group are associated with harm to health either in terms of death, heart disease, stroke or diabetes, but are probably beneficial in relation to these disease outcomes.

Table 7 Summary of the relative risk for milk and/or dairy food consumption and various diseases, together with the total numbers of deaths in England and Wales in 2008 from those causes
Fig. 1

The numbers of deaths in England and Wales in 2008 from various causes, and the risks for these causes in the subjects with the highest milk/dairy consumption, relative to the risk in the subjects with the lowest milk/dairy consumption

Apart from their effects on plasma lipids and on blood pressure, very little is known about the biological mechanisms likely to be involved in the relationships of milk and dairy foods with human diseases or, indeed, whether milk can be modified to provide increased health advantages. Clearly, more work should be done.

Due to a focus on the small rise in blood cholesterol with milk drinking, the debate on milk has never achieved a reasonable balance in the evaluation of risks and benefits. We believe that the debate about the health risks and benefits of milk and dairy consumption in Western communities should focus on evidence of direct relevance to health and survival, such as we have presented in this review, and this would benefit greatly if it were supported by a concerted and targeted research effort to understand the underlying mechanisms.


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Janie Hughes, research assistant, gave considerable help in the literature searches.


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Elwood, P.C., Pickering, J.E., Givens, D.I. et al. The Consumption of Milk and Dairy Foods and the Incidence of Vascular Disease and Diabetes: An Overview of the Evidence. Lipids 45, 925–939 (2010).

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  • Dairy
  • Milk
  • Butter
  • Cheese
  • Heart disease
  • Stroke
  • Diabetes
  • Cohort studies