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An Apple a Day Keeps the Doctor Away, for Adults Over 50 to Avoid Heart attacks and Strokes, a New BMJ Study

December 19, 2013

An apple a day keeps the doctor away

British Medicine JournalTuesday, December 17, 2013 - 08:58

Prescribing an apple a day to all adults aged 50 and over would prevent or delay around 8,500 vascular deaths such as heart attacks and strokes every year in the UK – similar to giving statins to everyone over 50 years who is not already taking them - according to a study in the Christmas edition of The BMJ.

The researchers conclude that the 150 year old public health message: “An apple a day keeps the doctor away” is able to match more widespread use of modern medicine, and is likely to have fewer side effects. The research takes into account people who are already appropriately taking statins to reduce their risk of vascular disease and therefore the authors stress that no-one currently taking statins should stop, although by all means eat more apples.

In the United Kingdom, lifestyle changes are the recommended first step to prevent heart disease. However, trial data suggest that statins can reduce the risk of vascular events, irrespective of a person’s underlying risk of cardiovascular disease. As such, calls are being made for greater use of statins at a population level, particularly for people aged 50 years and over.

Using mathematical models a team of researchers at the University of Oxford set out to test how a 150 year old proverb might compare with the more widespread use of statins in the UK population. They analysed the effect on the most common causes of vascular mortality of prescribing either a statin a day to those not already taking one or an apple a day to everyone aged over 50 years in the UK.

The researchers assumed a 70% compliance rate and that overall calorie intake remained constant.

They estimate that 5.2 million people are currently eligible for statin treatment in the UK and that 17.6 million people who are not currently taking statins would be offered them if they became recommended as a primary prevention measure for everyone over 50.

They calculate that offering a daily statin to 17.6 million more adults would reduce the annual number of vascular deaths by 9,400, while offering a daily apple to 70% of the total UK population aged over 50 years (22 million people) would avert 8,500 vascular deaths.

However, side-effects from statins mean that prescribing statins to everyone over the age of 50 is predicted to lead to over a thousand extra cases of muscle disease (myopathy) and over ten thousand extra diagnoses of diabetes.

Additional modelling showed a further 3% reduction in the annual number of vascular deaths when either apples or statins were prescribed to everybody aged over 30. However the number of adverse events is predicted to double.

“This study shows that small dietary changes as well as increased use of statins at a population level may significantly reduce vascular mortality in the UK,” say the authors.

“This research adds weight to calls for the increased use of drugs for primary prevention of cardiovascular disease, as well as for persevering with policies aimed at improving the nutritional quality of UK diets,” they conclude.

Dr. Adam Briggs of the BHF Health Promotion Research Group at Oxford University said: "The Victorians had it about right when they came up with their brilliantly clear and simple public health advice: "An apple a day keeps the doctor away". It just shows how effective small changes in diet can be, and that both drugs and healthier living can make a real difference in preventing heart disease and stroke.

While no-one currently prescribed statins should replace them for apples, we could all benefit from simply eating more fruit."

Contact:

Adam Briggs, NIHR Academic Clinical Fellow, BHF Health Promotion Research Group, Nuffield Department of Population Health, University of Oxford, Headington, Oxford, UK

 adam.briggs@dph.ox.ac.uk

http://www.bmj.com/press-releases/2013/12/17/apple-day-keeps-doctor-away

 

A statin a day keeps the doctor away: comparative proverb assessment modelling study

BMJ 2013; 347 doi: http://dx.doi.org/10.1136/bmj.f7267 

(Published 17 December 2013) Cite this as: BMJ 2013;347:f7267

Adam D M Briggs, academic clinical fellow, Anja Mizdrak, researcher, Peter Scarborough, senior researcher

Author Affiliations

1BHF Health Promotion Research Group, Nuffield Department of Population Health, University of Oxford, Headington, Oxford OX3 7LF, UK

Correspondence to: A D M Briggs adam.briggs@dph.ox.ac.uk

Accepted 27 November 2013

Abstract

Objective To model the effect on UK vascular mortality of all adults over 50 years old being prescribed either a statin or an apple a day.

Design Comparative proverb assessment modelling study.

Setting United Kingdom.

Population Adults aged over 50 years.

Intervention Either a statin a day for people not already taking a statin or an apple a day for everyone, assuming 70% compliance and no change in calorie consumption. The modelling used routinely available UK population datasets; parameters describing the relations between statins, apples, and health were derived from meta-analyses.

Main outcome measure Mortality due to vascular disease.

Results The estimated annual reduction in deaths from vascular disease of a statin a day, assuming 70% compliance and a reduction in vascular mortality of 12% (95% confidence interval 9% to 16%) per 1.0 mmol/L reduction in low density lipoprotein cholesterol, is 9400 (7000 to 12 500). The equivalent reduction from an apple a day, modelled using the PRIME model (assuming an apple weighs 100 g and that overall calorie consumption remains constant) is 8500 (95% credible interval 6200 to 10 800).

Conclusions Both nutritional and pharmaceutical approaches to the prevention of vascular disease may have the potential to reduce UK mortality significantly. With similar reductions in mortality, a 150 year old health promotion message is able to match modern medicine and is likely to have fewer side effects.

Introduction

“An apple a day keeps the doctor away,” a public health message delivered by parents and teachers since the 19th century,1 is an example of how concise, clear, and accurate Victorian health promotion can truly stand the test of time, whereas other Victorian practices—such as the use of leeches in primary care—have fallen away.

Today in the United Kingdom, lifestyle changes (such as increasing levels of physical activity or changing diet) are the recommended first step for primary prevention of vascular disease.2 Increasingly, however, calls are being made for greater use of drugs in primary prevention, perhaps the best known example being Wald and Law proposing the polypill in 2003.3 In the UK, the only drug class recommended for primary prevention at a population level is the hydroxymethyl glutaryl coenzyme A reductase inhibitors, or statins, and this is only for people at 20% or greater risk of a cardiovascular event in the next 10 years.2 Recent meta-analyses have indicated similar relative benefits to patients with a five year risk of a major vascular event of less than 1% to those at greater than 20% risk, without evidence of significant harm.4 This has led to calls to use statins for cardiovascular disease prevention at the population level, particularly for people aged 50 years and over.5

We set out to test how almost 150 years of Victorian wisdom might compare with the more widespread use of statins in primary prevention. We modelled the effect on vascular mortality of prescribing everybody in the UK over 50 years old either an apple (Malus domestica) a day or a statin a day, estimated the number of adverse events, and compared the subsequent drug, or fruit, costs.

Methods

Data on the effect on vascular mortality (any stroke, cardiac death, or other vascular death) of the UK population of a statin a day came from the Cholesterol Treatment Trialists’ meta-analysis, which found that reducing cholesterol with a statin reduces the relative risk of vascular mortality by 12% (95% confidence interval 9% to 16%) per 1.0 mmol/L reduction in low density lipoprotein cholesterol and that on average this is reduced by 1.08 mmol/L over a year of treatment.4 We applied this annual reduction to age and sex specific vascular mortality rates for the UK population aged 50 years and over who are not taking a statin for primary disease prevention as reported in the Health Survey for England (stratified by sex and five year age categories, with age and sex specific statin uptake for Scotland, Wales, and Northern Ireland assumed to be the same as for England).6 7 8 9 10 We assumed 70% compliance on a conservative basis; this was the lower of the two compliance values reported by Taylor et al in their recent Cochrane review (77% for statins, 70% for placebo).11 We calculated the reduction in deaths from vascular disease as the difference between the number of vascular deaths in the population not taking statins, using current age and sex specific mortality rates, and the number of deaths when assuming the new mortality rates. We calculated 95% credible intervals by applying the 95% confidence intervals surrounding the reduction in vascular mortality identified by the Cholesterol Treatment Trialists of 9% to 16%.4

We modelled the effect on vascular mortality (cerebrovascular disease, ischaemic heart disease, heart failure, and abdominal aortic aneurysm) of an apple a day on the entire UK population aged 50 years and over (whether taking statins or not) by using PRIME, a widely published comparative risk assessment model (see web appendix for more details).12 13 14 15 This uses meta-analyses of studies to parameterise the relation between a wide range of nutritional factors (g/day of fruit, vegetables, salt, and fibre; percentage of total energy derived from total fat, monounsaturated fatty acids, polyunsaturated fatty acids, saturated fatty acids, trans fatty acids, and dietary cholesterol; and total energy intake in kcal/day) and chronic disease mortality. On a conservative basis, we assumed apples to weigh 100 g, although weighing of various varieties identified examples of up to 250 g (authors’ measurements using household scales and a range of apples). Baseline population diet and the nutritional composition of apples came from the Living Costs and Food Survey 2010, in which the weekly weight of apples consumed was assumed to increase by 700 g (see table 1 for the nutritional information).16 We held the total calorie intake constant, assuming that the addition of calories consumed in apple form would lead to a proportionate decrease in calories consumed elsewhere in the diet. We assumed the effect on health of consuming an extra apple a day to be the same irrespective of baseline apple consumption, as described in the underlying meta-analyses describing the relations between fruit and vegetable consumption and cardiovascular disease.17 18 We assumed compliance to be 70% and prescribing of statins not to change. We calculated 95% credible intervals by using 5000 iterations of a Monte Carlo analysis to account for the variation in parameters describing the relations between different dietary components and mortality from cerebrovascular disease, ischaemic heart disease, heart failure, and abdominal aortic aneurysm (see web appendix for additional information on PRIME).

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Table 1

 Nutritional composition of 100 g of apple16

We modelled side effects of statins by using the Cholesterol Treatment Trialists’ reports of statins leading to an excess incidence of myopathy of 0.5/1000 patients over five years, of rhabdomyolysis of 0.1/1000 over five years, and of diabetes mellitus of 0.1% a year (the reported increased incidence of haemorrhagic strokes was not modelled because if fatal, these would be incorporated in the overall effect on vascular mortality).4 We applied these to the extra population aged over 50 who would be taking statins, assuming 70% compliance, to give an estimated number of additional adverse events per year. No side effects were modelled for increased apple consumption; aside from the distress caused by a bruised apple, and the theoretical risk of identifying half a worm inside, apple related adverse events are not widely recognised. People with an apple allergy could be prescribed an alternative less allergenic fruit with similar health benefits.17 18

We obtained costs of statins from the British National Formulary,19 applying the cost of a prescription of simvastatin 40 mg of £1.24/month to the number of extra people taking the drug to identify the total annual cost. The cost of an apple came from the Department for Environment, Food and Rural Affairs’ weekly fruit and vegetable prices for the cheapest variety of dessert apple (assuming the NHS would want to purchase at the lowest price) of 47 pence/kilo, or approximately 4.7 pence/apple assuming these apples are on the smaller side.20 No costs were estimated for general practice appointments or the management of any side effects.

Sensitivity analyses investigated the effect of prescribing statins or apples to everybody over 30 years rather than 50 years (the age from which the QRISK2-2011 scoring system is validated to predict 10 year cardiovascular risk21); the effect of 90% compliance with apple prescriptions (given that just 10% of the adult population manage less than one portion of fruit and vegetables a day22); and removing the assumption that the remainder of the diet, except calorie intake, would be adjusted to compensate for the additional apple.

Results

We estimate that 5.2 million people are eligible for statin treatment in the UK, with an extra 17.6 million people being offered it should it become recommended as a primary prevention measure for all adults aged over 50. Assuming 70% compliance, offering statins to 17.6 million more adults would result in a reduction in the annual number of vascular deaths by 9400 (95% credible interval 7000 to 12 500).

Table 2 shows the baseline daily UK diet and the diet after inclusion of an apple a day (assuming no change to calorie consumption).16 Applying this diet to 70% of the total UK population aged over 50 years (70% of the 22 million people in the UK aged over 50 years), we estimate the annual number of vascular deaths averted or delayed to be 8500 (95% credible interval 6200 to 10 800). Prescribing statins to everyone over the age of 50 years is predicted to lead to 1200 excess cases of myopathy, 200 cases of rhabdomyolysis, and 12 300 diagnoses of diabetes mellitus. The total extra cost of statin treatment from the drug alone is estimated at £180m (€217m; $295m), compared with £260m for the apples.

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Table 2

 Nutritional composition of baseline UK diet16 and diet after introduction of an apple a day

Sensitivity analyses

Prescribing either apples or statins to everybody over 30 years old is estimated to reduce the annual number of vascular deaths by 8800 (6500 to 11 100) or 9600 (7200 to 12 900) respectively, 3% more than prescribing to everybody over 50 years. The number of adverse events is predicted to double to 2400 cases of myopathy, 400 of rhabdomyolysis, and 24 400 excess diabetes diagnoses. The cost of statins would be £360m, and that of apples £480m. If compliance with apple prescriptions was 90%, the number of vascular deaths averted would increase to 11 000 (8100 to 13 900); this is 29% more than with 70% compliance, costing £339m in apples. Finally, if the apple prescription has no effect on any aspect of the average diet except amount of fruit consumed, annual vascular deaths would reduce by 7100 (5000 to 9400), 20% fewer than if dietary compensation occurs; costs would remain the same.

Discussion

Prescribing either an apple a day or a statin a day to everyone over 50 years old is likely to have a similar effect on population vascular mortality. Choosing apples rather than statins may avoid more than a thousand excess cases of myopathy and more than 12 000 excess diabetes diagnoses. The basic costs of apples are likely to be greater than those of statins; however, NHS prescription prices and convenience may drive people to purchase their apples from a store rather than through a pharmacy, thereby reducing direct NHS costs, or the NHS may be able to negotiate apple price freezes (although defrosted apples may not be so palatable).23

Strengths and limitations

The strengths of this study lie in the underlying data used to parameterise the population effect of statins and the PRIME model, which came from meta-analyses of trials and prospective cohort studies (see web appendix for further details of the PRIME model).4 12 13 14 15

The exact definition of vascular mortality used differs slightly between the Cholesterol Treatment Trialists and the PRIME model. However, the most common causes of vascular death (ischaemic heart disease and stroke) are modelled for both statins and apples, making any remaining differences negligible in their effect size.

When estimating adverse events, as the Cholesterol Treatment Trialists note, the reduction in the number of vascular events due to the increased use of statins vastly outweighs the excess incidence of haemorrhagic stroke and diabetes.4 However, limitations of the Cholesterol Treatment Trialists’ meta-analysis have been suggested, including underestimation of side effects and absence of an effect on all cause mortality for patients at low risk.24 This would suggest that our estimates of side effects from statins are conservative and that an added benefit of apples over statins may exist in terms of all cause mortality.

Our estimates of costs apply only to the basic cost of the intervention. We make no estimate of the cost to the health service of either accessing prescriptions or managing side effects.

The predicted effects of a change in national policy to provide statins to everybody aged over 50 could vary for several reasons. Although a conservative estimate, treatment compliance may be less than 70% in a population who may think of themselves as not needing the treatment. However, the shock effect of the policy may stimulate more people who are eligible for treatment but are not accessing it to seek medical care. Furthermore, compliance may reduce over time, meaning our results could overestimate future benefits and future adverse events. We also apply the same treatment effect on vascular mortality to people of all ages, sexes, and cardiovascular risk profiles, and in reality these may differ.21 We assume that the age and sex distribution of the population taking of statins in the UK is the same as that found in the Health Survey for England.10

The estimate of population compliance with an apple a day is less evidence based. Although apples are of course both delicious and nutritious, this view is not consistently shared across the population; as much as 69% of UK adults do not meet the recommendation of five portions of fruit and vegetables a day.25 Whether this is due to the difficulty of accessing fresh fruit and vegetables, costs, or simply preference is unclear, but access through a pharmacy may go some way to reducing these barriers. Despite 69% of adults not getting their five a day, only 10% eat less than one portion a day22; our sensitivity analysis that assumes the remaining 90% could manage an extra portion suggests that as many as 11 000 vascular deaths could be averted annually. Equally challenging may be the increased time and difficulty associated with consuming an apple compared with a statin—statins need a glass of water and a quick gulp, whereas apples require the more complex and time consuming process of coordinated mastication and swallowing.

Further limitations of this research are that fruit costs were taken in the autumn (a relatively cheap season) but are likely to vary around the year, and people may save money by spending less on their weekly shopping trip. The uncertainty estimates surrounding changes in mortality do not represent uncertainty associated with compliance or with the structural uncertainty of the PRIME model. Total calories consumed are assumed to remain the same in the apple model, consistent with previous modelling research,26 but what people may substitute their apple for is unclear. We assumed that the nutritional components of the average diet (table 2) would proportionately reduce by the increase in calories from 100 g of apple, but people might choose to remove other fruits from their diet instead. Having said this, if just 31% of the population are having five portions of fruit and vegetables a day in the first place, such substitutions may not be an option for many people. People may also choose to consume fewer total calories by replacing foods with a higher energy density with the low energy dense apple, potentially leading to even greater benefits on vascular mortality through reduced body mass index.27 Furthermore, increased fruit consumption is related to reduced risk of various cancers, again adding to the apple’s health benefits.28 Our sensitivity analysis that assumes no change in population diet except in the quantity of fruit consumed predicts 7100 fewer vascular deaths a year, with the 95% credible intervals still overlapping the effect size estimated from increased statin prescriptions.

Finally, we have not estimated the potential wider benefits of more than 12 million extra statin prescriptions to the drug industry and the jobs that would create, the boost to the apple farming industry of around 22 million extra daily requests for apples, or the effect on quality of life of fewer non-fatal vascular events.

Meaning of study

This study shows that small dietary changes as well as increased use of statins at a population level may significantly reduce vascular mortality in the UK. The five a day campaign to increase UK fruit and vegetable consumption is laudable in its aims and has the potential to deliver true population health benefits.29 30 However, the UK is yet to adopt drug prescribing as a population level approach to primary prevention; current guidelines only affecting people at high risk of a cardiovascular event.2 This research adds weight to calls for the increased use of pharmacological interventions for primary prevention of cardiovascular disease, as well as for persevering with policies aimed at improving the nutritional quality of UK diets.

Conclusions

The comparison of a medicalised approach to chronic disease prevention with that of a lifestyle one has been previously estimated (polypill versus polymeal), although, in our view, not with any realistic hope of changing population behaviour, despite the suggestion to employ out of work cardiologists as chefs.31 We offer a simplified version of this: our study suggests that both nutritional and pharmaceutical population approaches to primary prevention of vascular disease have the potential to have a significant effect on population mortality. We find that a 150 year old proverb is able to match modern medicine and is likely to have fewer side effects. Now to model the effect of inquisitiveness on feline mortality rates.

What is already known on this topic

Trial data show that statins reduce the risk of vascular events irrespective of baseline cardiovascular disease risk

An apple a day keeps the doctor away

What this study adds

An apple a day or a statin a day is equally likely to keep the doctor away

Notes

Cite this as: BMJ 2013;347:f7267

Footnotes

We acknowledge Lennert Veerman for his contribution to suggestions regarding the modelling of adverse events.

Contributors: ADMB devised a different study involving superheroes; PS expanded the idea and wanted to do that one. ADMB instead devised this study and talked PS out of the other one. Therefore, for this study, PS developed the PRIME model. ADMB and AM completed the modelling, and ADMB drafted the manuscript. ADMB and PS contributed to the study design. ADMB, PS, and AM reviewed and critiqued the final manuscript. PS will have to wait until next year to write a paper about superheroes. ADMB is unlikely to help him, but AM could be talked around to the idea. ADMB is the guarantor.

Funding: No explicit funding for this work was sought. ADMB is a National Institute for Health Research funded academic clinical fellow in public health. PS and AM are funded by the British Heart Foundation. The funders had no role in the design, process, or reporting of this study.

Competing interests: All authors have completed the ICMJE uniform disclosure form at www.icmje.org/coi_disclosure.pdf and declare: no support from any organisation for the submitted work; PS has received research grants from the British Heart Foundation; ADMB eats five a day, AM tries to, and PS is a vegetarian; all diets include apples; neither ADMB, AM, nor PS takes statins, and all purport to be under 50 years old.

Ethical approval: This study used routinely collected publicly available datasets; ethics approval was not needed.

Transparency declaration: The lead author (the manuscript’s guarantor) affirms that this manuscript is an honest, accurate, and transparent account of the study being reported; that no important aspects of the study have been omitted; and that any discrepancies from the study as planned (and, if relevant, registered) have been explained.

Data sharing: All data used in this study are freely available secondary data sets.

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/.

References

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http://www.bmj.com/content/347/bmj.f7267


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