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Revista de Nutrição

Print version ISSN 1415-5273On-line version ISSN 1678-9865

Rev. Nutr. vol.29 no.1 Campinas Jan./Feb. 2016 

Original Articles

Adherence to non-pharmacological treatment: Analysis of the impact of three health educational and nutritional strategies in hypertensive patients

Adesão ao tratamento não farmacológico: análise do impacto de três estratégias de educação em saúde e nutrição em portadores de hipertensão arterial

Juliana Costa MACHADO1 

Rosângela Minardi Mitre COTTA1 

Tiago Ricardo MOREIRA2 

Luciana Saraiva da SILVA1 

1Universidade Federal de Viçosa, Centro de Ciências Biológicas, Departamento de Nutrição. Campus Universitário, s/n., 36570-900, Viçosa, MG, Brasil. Correspondência para/Correspondence to: JC MACHADO. E-mail: <>.

2Universidade Federal de Viçosa, Centro de Ciências Biológicas, Departamento de Enfermagem e Medicina. Viçosa, MG, Brasil.



To evaluate adherence to non-pharmacological treatment of hypertension by comparing biochemical, clinical, anthropometric, and dietary parameters before and after three health educational and nutritional strategies.


This longitudinal clinical trial included 212 hypertensive individuals who met the inclusion criteria. The participants were allocated to three groups to assess the impact of monthly intervention methods over twelve months.


Waist circumference decreased significantly in all groups. Weight and body mass index decreased significantly in Groups 2 and 3. Blood glucose, total cholesterol, and low-density lipoprotein cholesterol decreased significantly in Groups 1 and 2. The interventions also reduced the mean per capita intakes of oil, sugar, and salt in all groups.


Educational interventions promoted adherence to non-pharmacological treatment of treatment of hypertension evidenced by anthropometric (weight, body mass index, and waist circumference), biochemical (blood glucose, total cholesterol, and low-density lipoprotein cholesterol), and dietary (meanper capita intake of oil, sugar, and salt) parameters.

Keywords: Food and nutrition education; Health education; Hypertension



Avaliar a adesão ao tratamento não farmacológico da hipertensão arterial sistêmica por meio de parâmetros antropométricos, bioquímicos, clínicos e dietéticos antes e após três estratégias de educação em saúde e nutrição.


Trata-se de um estudo de intervenção longitudinal, do tipo ensaio comunitário, comparativo, de abordagem quantitativa. A amostra foi constituída de 212 indivíduos com diagnóstico de hipertensão arterial sistêmica que atenderam aos critérios de inclusão/exclusão. Os participantes foram alocados em três grupos de forma a avaliar o impacto das modalidades de intervenção realizadas mensalmente durante 12 meses.


No grupo 1, houve redução estatisticamente significante da circunferência da cintura. Nos grupos 2 e 3, os resultados foram estatisticamente significantes para o peso, índice de massa corporal e circunferência da cintura. Foram verificadas reduções estatisticamente significantes na glicemia, no colesterol total e lipoproteína de baixa densidade nos grupos 1 e 2. As intervenções também foram capazes de promover alterações favoráveis no consumo médio per capita de óleo, açúcar e sal em todos os grupos.


As intervenções educativas propiciaram resultados positivos sobre a adesão ao tratamento não farmacológico da hipertensão arterial sistêmica, considerando os parâmetros antropométricos (peso, índice de massa corporal e circunferência da cintura), bioquímicos (glicemia, colesterol total e lipoproteína de baixa densidade), e dietéticos (consumo médio per capita de óleo, açúcar e sal).

Palavras-chave: Educação alimentar e nutricional; Educação em saúde; Hipertensão


Hypertension is a multifactorial clinical condition characterized by high and sustained blood pressure levels. It is considered a chronic Non-Communicable Disease (NCD) and an independent and modifiable risk factor for cardiovascular and renal diseases. Hypertension is responsible for 13.5% of all deaths in the world, representing a severe public health problem because of its high prevalence, low control rate, and high economic and social costs1,2. The prevalence of hypertension in Brazil varies by region and age group; the mean prevalence is 32.5%, but the prevalence increases to 50.0% in individuals aged 60 to 69 years and to 75.0% in individuals aged more than 69 years1.

Although the available therapies have proven effective, many studies show low adherence to hypertension treatment. If low adherence could be remediated, it could reduce morbidity and mortality. Adherence rates to hypertension treatment in Brazil are low, varying from 23.0 to 62.1%3-5.

Adherence to hypertension treatment is defined by the World Health Organization (WHO) as the degree to which the behavior of an individual corresponds to and agrees with the therapeutic recommendations made by a health professional5. Behavioral risk factors constitute the main targets of hypertension prevention and treatment because when corrected, they effectively reduce blood pressure and its complications. The main non-pharmacological recommendations to prevent primary hypertension are: losing weight, reducing salt and alcohol intakes, quitting smoking, practicing physical activity regularly, and eating healthy1,6-8.

Community-based intervention programs that associate health promotion with disease prevention have been conducted in different countries since the early 1970s. The objective of these programs is to reduce NCD morbidity and mortality by providing community health education, thereby reducing NCD-associated risk factors. These programs have had different levels of impact on hypertension risk factors9.

Health education strategies are an important instrument for encouraging lifestyle changes and reducing cardiovascular risk factors. Education reduces blood pressure, body weight, and waist circumference; and improves lipid profile, blood glucose, habitual food intake, and knowledge about the health-disease-care process8,10.

In agreement with the WHO recommen-dations, the Strategic Action Plan against NCD launched in Brazil (2011-2022) recommends controlling hypertension using health promotion and protection policies in Primary Health Care5,6. In order to increase adherence, Primary Health Care must develop educational activities that promote care and increase the effectiveness of lifestyle modification processes7. In this sense, the objective of the present study was to assess adherence to a non-pharmacological treatment of hypertension by measuring anthropometric, biochemical, clinical, and dietary parameters before and after three health and nutrition education strategies.


This longitudinal clinical trial was conducted at a Primary Health Care unit located in the urban area of a small municipality from July 2012 to July 2013.

The sample consisted of 212 individuals formally diagnosed with hypertension and followed by the Hiperdia Program. The participants agreed to participate in the study. All participants were taking antihypertensive medications. The inclusion criteria were: age of 18 years or more; presence of hypertension; not receiving nutritional follow-up; and availability to participate in group activities. The exclusion criteria included possible confounders, such as pregnancy, severe clinical conditions such as dementia, advanced multiple sclerosis, blindness, deafness, active tuberculosis, disabling paralysis, and a history of alcohol or illicit drug abuse.

The study health education model was based on criteria of interactivity, dialogue, and problematization of reality experienced by the participants that help them fight non-adherence to treatment11. All interventions involved active education methods that opened critical, participative, and co-responsibility spaces between Primary Health Care users and health teams. The workshops, which lasted approximately one hour each, were held once a month at the Primary Health Care facility and used different teaching resources, such as posters, videos, and hands-on cooking demonstrations, with active pupil participation. Monthly home visits lasting roughly 45 minutes were scheduled with the participants in advance. The home visits had a systematized plan, and practical advice was shaped to the reality of each family by checking the acquired food items and how they were prepared and consumed. The workshops and home visits were planned and made by two research dieticians. The program content was based on Cervatto12.

The interventions lasted twelve months and consisted of the group following strategies (Chart 1):

Chart 1 Composition of the groups and workshops on health education for hypertensive individuals. Brazil, 2014. 

Group 1: Monthly workshops to educate and prevent diseases, emphasizing on dietary hypertension therapy using participative and interlocutory educational activities. The group consisted of individuals who attended at least eight group workshops.

Group 2: Monthly workshops and home visits. The home visits were made during the main daily meal and followed a systematic nutrition education plan. The group consisted of 21 individuals chosen randomly. The sample size was defined in advance for home visit feasibility.

Group 3: Monthly workshops to educate and prevent diseases, as in Group 1. The group consisted of individuals who attended fewer than eight group workshops spontaneously.

The participants were allocated to these three groups based on the number of workshops they attended and/or whether they received home visits. The lowest acceptable workshop attendance (n=8) was given by the median attendance and the results obtained by Ribeiro et al.8, who found that five months of intervention were not enough for participants to incorporate long-term changes in health and eating behaviors. Based on this criterion, individuals were allocated to groups 1 or 3 after the intervention.

Socioeconomic and lifestyle data were collected during individual interviews before the intervention. Anthropometric and biochemical variables, systolic and diastolic blood pressures, and physical activity and habitual food intake data were collected before and after the interventions. Smoking status was considered positive if the individual self-reported as a smoker at the time of the interview. Individuals were considered alcohol users if they had consumed alcohol in the last 30 days, regardless of amount.

Weight was measured by the electronic scale Marte(r) (Marte Científica, São Paulo, Brazil) with a capacity of 199.95 kg and accuracy of 50 g; height was measured by the platform stadiometer Alturexata(r) (Belo Horizonte, Minas Gerais, Brazil) with a length of 213 cm and vertical accuracy of 1 mm, as recommended by Jelliffe13. Body Mass Index (BMI) was calculated and classified as recommended by the WHO for adults14 and by Lipschitz15 for older adults. Waist circumference was measured at the midpoint between the iliac crest and the lowest rib upon exhalation using an inelastic tape and classified according to the cut-off points proposed by the WHO16.

Laboratory tests included total cholesterol and fractions (Low Density Lipoprotein - cholesterol [LDL-c], high density lipoprotein, and very low density lipoprotein), triglycerides, and fasting blood glucose. The participants were asked to fast for 12 hours before blood collection. The laboratory reference techniques and criteria were used for quantifying and classifying the results. Biological material collection and analysis were performed at a laboratory certified by the Ministry of Health. Blood was collected by venipuncture. The quantifications were made by the equipment A15 (Biosystems(r), Curitiba, Paraná, Brazil) according to the automation protocol of the abovementioned laboratory kit. Blood pressure was measured during the workshops indirectly using auscultation and the aneroid sphygmo-manometer (Premium(r), Accumed, Duque de Caxias, Rio de Janeiro, Brazil). Two measurements were made at a one-minute interval. Blood pressure was classified according to the procedures and parameters provided by the "VI Brazilian Guidelines on Hypertension"1.

Habitual food intake was investigated to determine per capita oil, salt, and sugar intakes. The daily per capita amounts were given by estimating the monthly household consumption of these items and dividing the estimate by the number of days in the month and household members.

The level of physical activity was estimated by the short version of the International Physical Activity Questionnaire created by the WHO, and translated into Brazilian Portuguese and validated for Brazil by Matsudo et al.17. Individuals who practiced a total of at least 30 minutes of moderate physical activity a day in five or more days a week were considered active.

The data were analyzed by the programs Statistical Package for the Social Sciences (SPSS Inc., Chicago, Illinois, United States) for Windows, version 20.0 and Excel 2010 (Microsoft Coporation, Redmond, Washington, United States). The descriptive analysis of the quantitative variables included measures of central tendency (mean) and variability (standard deviation). The Kruskal-Wallis test measured homogeneity between the groups. The Kolmogorov-Smirnov test determined whether the variables had normal distribution. The variables with and without normal distribution were compared by the paired t test and Wilcoxon test (nonparametric variables), respectively. The significance level was set at 5% (p<0.05).

The study was approved by the Research Ethics Committee of the Universidade Federal de Viçosa under Protocol nº 044/2012/CEPH, in agreement with Resolution nº 466/2012 of the National Health Council.


Eighty (27.0%) out of the 292 study participants dropped out; of these, 65 (22.0%) did not spontaneously participate in the second stage of the study; 6 (2.0%) died; 4 (1.3%) moved to another municipality; and 5 (1.7%) developed a disabling illness. Hence, the 212 individuals that composed the final sample represented 31.0% of the municipal hypertensive population. The mean age was 66.94 years (minimum age of 29 years and maximum age of 90 years, Standard Deviation-SD=±11.29). Most participants were females (75.5%), and had low education level (84.0%) and low income (84.2%).

Table 1 shows the demographic and socioeconomic characteristics of the study sample according to the intervention groups. The groups did not differ significantly: all groups were homogeneous with respect to the baseline characteristics. Therefore, the three groups had similar demographic and socioeconomic characteristics. Most individuals were female older adults or adults aged 30 to 59 years; were married, retired, or pensioners; had never smoked; had fewer than four years of formal education; and had an income of 1 to 3 minimum salaries per month. Most participants with income contributed to the household budget. More than 90.0% of the participants owned their homes. The percentage of alcohol users varied: Groups 2 and 3 had a higher percentage of individuals who reported having consumed alcoholic beverages in the last 30 days, regardless of amount (85.7 and 75.5%, respectively), but the differences were not significant.

Table 1.  Demographic and socioeconomic characteristics of hypertensive individuals who participated in three types of intervention (Groups 1, 2, and 3). Brazil, 2014. 

Note: *p-value for the difference between Groups 1, 2, and 3 according to the Kruskal-Wallis test at a significance level of 5%.

Tables 2, 3, and 4 shows the anthropometric, blood pressure, biochemical, dietary, and physical activity data of Groups 1, 2, and 3 before and after the intervention. Regarding anthropometric variables, Group 1 lost a mean of 3.3 cm of waist circumference, a significant difference. The following biochemical parameters also decreased significantly: fasting glucose (105.4 mg/dL to 98.9 mg/dL), total cholesterol (206.5 mg/dL to 188.7 mg/dL), and LDL-c (130 mg/dL to 111 mg/dL). All dietary variables also decreased significantly: per capita oil intake had a mean decrease of 12.1 mL; per capita sugar intake had a mean decrease of 30 g; and per capita salt intake decreased from 10.4 g to 7.4 g. Regarding physical activity, only 28% of the group was considered active and the intervention did not promote any change.

Table 2. Anthropometric, blood pressure, biochemical, dietary, and level of physical activity characteristics of Group 1 before and after the intervention. Brazil, 2014. 

Note: ap-value for the difference of the values before and after the intervention for Group 1 according to the paired t test or bWilcoxon test at a significance level of 5%. *Statistically significant value.

M: Mean; SD: Standard Deviation; LDL: Low-Density Lipoprotein; HDL: High-Density Lipoprotein; VLDL: Very Low-Density Lipoprotein.

Table 3. Anthropometric, blood pressure, biochemical, dietary, and level of physical activity characteristics of Group 2 before and after the intervention. Brazil, 2014. 

Note: ap-value for the difference of the values before and after the intervention for Group 2 according to the paired t test or bWilcoxon test at a significance level of 5%. *Statistically significant value.

M: Mean; SD: Standard Deviation; LDL: Low-Density Lipoprotein; HDL: High-Density Lipoprotein; VLDL: Very Low-Density Lipoprotein.

Table 4. Anthropometric, blood pressure, biochemical, dietary, and level of physical activity characteristics of Group 3 before and after the intervention. Brazil, 2014. 

Note: ap-value for the difference of the values before and after the intervention for Group 3 according to the paired t test or bWilcoxon test at a significance level of 5%. *Statistically significant value.

M: Mean; SD: Standard Deviation; LDL: Low-Density Lipoprotein; HDL: High-Density Lipoprotein; VLDL: Very Low-Density Lipoprotein.

Group 2 also saw reductions in all their anthropometric variables. They lost an average of 4.4 cm of waist circumference. Their biochemical parameters also decreased significantly: fasting glucose from 112.3 mg/dL to 101 mg/dL; total cholesterol from 204.8 mg/dL to 185.2 mg/dL; and LDL-c from 124.7 mg/dL to 110 mg/dL. Triglyceride levels also decreased on average 28.0 mg/dL, but the reduction was not significant. Per capita oil intake decreased by 11 mL, also not significant. The percentage of physically active individuals decreased with the intervention, but not significantly.

Group 3 experienced significant reductions in the following variables: weight, BMI, and waist circumference. However, of the biochemical parameters, only total cholesterol decreased (195 mg/dL to 186 mg/dL). LDL-c had a mean significant increase of 78 mg/dL. The dietary variables also presented significant differences: mean per capita oil, sugar, and salt intakes decreased by 5 mL, 30 g, and 3 g, respectively. Regarding physical activity, this group had a higher percentage of active individuals than Groups 1 and 2 (37.8%). After the intervention this percentage decreased to 27.7%, but the difference was not significant.


The study results show that the educational interventions increased adherence to non-pharmacological hypertension treatment, as evidenced by anthropometric (weight, Body Mass Index, and waist circumference), biochemical (blood glucose, total cholesterol, and LDL-c), and dietary (mean per capita intakes of oil, sugar, and salt) parameters. It is consensus that structured health education programs for hypertension patients improve their health conditions, including risk factors and adherence to the recommended treatment7,18. Studies that analyzed the effectiveness of educational interventions in hypertension individuals found that education programs improved their behavior and adherence to non-pharmacological treatment considerably8,19,20. However, the reluctance of patients and health professionals to believe in the effectiveness of health education actions for a number of reasons is also discussed, such as: the method used, which is often prescriptive, normative, and out of context with respect to the population's reality; the trumping of professional knowledge over popular knowledge and of clinical practice over promotive and preventive actions; the tendency of health actions to be fragmented, disarticulated, and not multidisciplinary; and the population's little interest in changing life habits19-22.

The socioeconomic characteristics of the study population were similar to those of other samples, where most participants in educational activities provided by Primary Health Care services are female older adults, have low education level and income, and are retired or pensioners8,19. In face of the current demographic, epidemiological, and nutritional transitions, and the increase in life expectancy and prevalence of NCD, the health care provided by Primary Health Care needs to be reassessed, prioritizing actions that meet individuals' needs and that help them to adopt healthy habits23. Regarding life habits, only Group 3 had a higher proportion of smokers (22.0%) than the national mean (11.3%)24. On the other hand, the proportions of individuals in Groups 2 and 3 who had consumed alcohol in the last thirty days were higher than those reported by other studies21,22,25.

Obesity is closely related to hypertension. There is a positive and linear relationship between BMI and blood pressure. It is estimated that each 1.25 kg/m2 increase in BMI in women and 1.70 kg/m2 in men increase systolic blood pressure by 1 mmHg. Likewise, a body weight loss of 10 kg can reduce systolic blood pressure by 5-20 mmHg. Another factor that influences blood pressure is body fat distribution. A waist circumference increase of 2.5% in men and 4.5% in women is estimated to increase systolic blood pressure by 1 mmHg26. High waist circumference is a risk factor for metabolic and cardiovascular diseases, even when BMI is appropriate27.

Regarding anthropometric parameters, all groups lost weight, BMI, and waist circumference. Only Group 1 had significant waist circumference reduction. Groups 2 and 3 had significant weight, BMI, and waist circumference reductions. The better results achieved by Group 2 are justified by their participation in educational workshops and home visits, which intensify the intervention. Home visits allow focusing educational practice on the difficulties faced by the participants and their families, contributing to adherence to treatment and maintenance of healthy habits20. Meanwhile in Group 3, anthropometric improvements were accompanied by an increase in LDL-c, suggesting that the variables should be taken together to assess the results of the interventions.

Studies have observed how challenging it is for hypertension patients to control their blood pressure, even when receiving primary care follow-up28,29. In the present study, mean systolic and diastolic blood pressure did not change significantly, remaining close to 120/80 mmHg, a result similar to that of another educational intervention study30.

Groups 1 and 2 experienced significant reductions in blood glucose, total cholesterol, and LDL-c. A five-month study that compared two intervention strategies found that only blood glucose improved among individuals who received home visits8. The results of interventions that aim to change habits depend on intervention frequency and type, whether individual or group31. The 12-month interventions of the present study may have contributed to the positive results of the group that attended the most workshops and the group that attended workshops and received home visits.

The study interventions were capable of promoting favorable changes in the meanper capita intakes of oil, sugar, and salt in all groups. However, the per capita intakes of these food items are still above the intakes recommended for the Brazilian population. Oil intake should not exceed 16 mL per capita31. Hence, the per capita intake of soybean oil was twice the recommended amount, and this did not take into account the intake of other oils, fats, and respective sources throughout the day. The present results regardingper capita sugar intake are in agreement with a study that estimated the sugar intake of the Brazilian population, which found that intake was excessive, exceeding by more than 60% the maximum amount recommended by the WHO32. The current recommendation is that calories from sugar should not exceed 10% of the daily calorie intake in a healthy diet. More health benefits can be achieved if daily intake of calories from sugar does not exceed 5% of the daily calorie intake (roughly 25 g of sugar a day). The WHO recommendation regards all types of sugar (sucrose, glucose, and fructose), and their sources, such as refined sugar, honey, fruit juices, fruit pulps, and sugar added to commercially processed foods. Salt intake also exceeds the recommended amount, which is of less than 5 g of salt/day, and confirms the national mean33. Even if the reduction in the mean per capita intake of these food items is inadequate, this reduction is enough to improve many conditions related to hyper-tension risk factors, such as dyslipidemia and glucose intolerance26. Although one cannot infer that these intake changes resulted exclusively from the educational interventions, the results show that the interventions promoted positive dietary changes. Thus, since eating behavior changes slowly and gradually, ongoing educational strategies may be required for long-term changes.

Increasing the prevalence of physical activity is one of the goals of many foreign guidelines for preventing diseases and promoting health3,5. Considering the study classification criteria, most participants did not reach the recommended levels of physical activity needed to improve health1. Studies have found that inactivity is common among hypertension patients25,34. Additionally, most of the study participants were older adults, with very ingrained habits, and physical and functional age-related limitations that require the planning of physical activity programs that meet their particularities.

In the present study, regular intervention over 12 months allowed focusing attention on the specific difficulties experienced by each group and promoted a bond between the researcher and the participants. The emancipatory health education approach tried to widen the subjects' critical view to facilitate the means by which they can best care for their health, integrating their values and customs. Therefore, as in all NCD, hypertension treatment requires ongoing motivation for the patient not to abandon the treatment because it establishes a relationship of trust, dialogue, and respect20.

One limitation is that assessment of adherence to non-pharmacological hypertension treatment is a complex process and its effectiveness depends on factors that include individuals' commitment and motivation, family support, bonding with the health team, socioeconomic and cultural influences, and health-related beliefs. All these factors along with the intervention may have contributed to the improvement of the study parameters. The subtle differences in the impact of the interventional modalities may reflect characteristics of the study population or result from a possible sampling bias because this was an uncontrolled intervention study. A control group was not included for ethical reasons. Finally, adherence to hypertension treatment imposes the challenge of reconsidering the educational strategies developed in Primary Health Care to improve health outcomes.


Adherence to non-pharmacological hypertension treatment is a challenge for health systems because it occurs in the medium and long run and depends on individuals' efforts and support from health professionals. The present study evidenced that educational interventions increase adherence to non-pharmacological hypertension treatment as evidenced by the following parameters: anthropometric (weight, BMI, and waist circumference), biochemical (blood glucose, total cholesterol, and LDL-c), and dietary (mean per capita intakes of oil, sugar, and salt). The interventions over 12 months and the educational method may have contributed to these findings.

Hence, organization of integrated and ongoing educational actions for the non-pharmacological treatment of hypertension is justified by recent pieces of evidence, namely, that the combination of nutrition education, regular physical activity, and healthy behaviors reduces the morbidity and mortality caused by hypertension.


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Support: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (AUX-PE-Pro-Ensino Saúde 2034/2010, Process nº 23038.009788.12010-78) e Fundação de Amparo à Pesquisa de Minas Gerais (Edictal 14/2012, Process nº CDS-APQ-03594-12).

Recebido: 26 de Novembro de 2014; Revisado: 03 de Setembro de 2015; Aceito: 24 de Setembro de 2015

COLLABORATORS JC MACHADO helped to conceive and plan the study, analyze the data, and develop other stages of article writing. RMM COTTA helped to plan the study and review the manuscript. TR MOREIRA helped to plan the study and analyze the data. LS SILVA helped to analyze the data and create a draft.

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