The effectiveness of e-& mHealth interventions to promote physical activity and healthy diets in developing countries: A systematic review
International Journal of Behavioral Nutrition and Physical Activity volume 13, Article number: 109 (2016)
Promoting physical activity and healthy eating is important to combat the unprecedented rise in NCDs in many developing countries. Using modern information-and communication technologies to deliver physical activity and diet interventions is particularly promising considering the increased proliferation of such technologies in many developing countries. The objective of this systematic review is to investigate the effectiveness of e-& mHealth interventions to promote physical activity and healthy diets in developing countries.
Major databases and grey literature sources were searched to retrieve studies that quantitatively examined the effectiveness of e-& mHealth interventions on physical activity and diet outcomes in developing countries. Additional studies were retrieved through citation alerts and scientific social media allowing study inclusion until August 2016. The CONSORT checklist was used to assess the risk of bias of the included studies.
A total of 15 studies conducted in 13 developing countries in Europe, Africa, Latin-and South America and Asia were included in the review. The majority of studies enrolled adults who were healthy or at risk of diabetes or hypertension. The average intervention length was 6.4 months, and text messages and the Internet were the most frequently used intervention delivery channels. Risk of bias across the studies was moderate (55.7 % of the criteria fulfilled). Eleven studies reported significant positive effects of an e-& mHealth intervention on physical activity and/or diet behaviour. Respectively, 50 % and 70 % of the interventions were effective in promoting physical activity and healthy diets.
The majority of studies demonstrated that e-& mHealth interventions were effective in promoting physical activity and healthy diets in developing countries. Future interventions should use more rigorous study designs, investigate the cost-effectiveness and reach of interventions, and focus on emerging technologies, such as smart phone apps and wearable activity trackers.
The review protocol can be retrieved from the PROSPERO database (Registration ID: CRD42015029240).
In 2012, about 38 million global deaths were attributed to non-communicable diseases (NCDs) such as diabetes, cardiovascular diseases and cancer, and it is expected that NCD death rates will increase further, reaching 52 million by 2030. The NCD burden is particularly high in developing countries with 82 % of global NCD-related deaths occurring in low and middle income countries [1, 2].
Major NCD prevention strategies include the reduction of behavioural risk factors, especially physical inactivity and unhealthy diets [1, 3–6]. There is extensive evidence on the preventive effects of regular physical activity and healthy eating on the risk of developing a NCD [7, 8]. For example, a 25 % reduction in physical inactivity is estimated to prevent about 1.3 million NCD-related deaths annually  while a healthy diet and increased physical activity can prevent a significant proportion of the 18 million deaths caused by high blood pressure, high body mass index, high fasting blood glucose and high total cholesterol .
In developing countries, rapid globalization is contributing to a change in people’s diets where local low calorie and high fibre foods are replaced by readily available, cheap and processed foods high in fat, salt and sugar [8, 11]. For example, in developing countries in Asia, the consumption of processed foods increased by more than 5 % between 1999 and 2012. In contrast, the consumption of processed foods in developed countries increased only by 0.2 % . Additionally, rapid technological development decreases the necessity of physical labour and active transport which in turn contributes to decreasing levels of physical activity [8, 13, 14]. Decreasing physical activity levels were observed in most Asian [15, 16], Latin-and South American [17–19] and some African countries [13, 20] as urbanization increased.
One promising way to promote physical activity and healthy diets in developing countries is to implement electronic and mobile health (e-& mHealth) interventions. These interventions are primarily delivered via modern information and communication technologies (ICT) such as the Internet, mobile phones, and other wireless devices . The proliferation of such ICTs is very high in developing countries. For example, in 2015, 90 % of people living in developing countries owned a mobile phone and two thirds of the global Internet users were based in developing countries [22, 23]. Therefore, it is feasible, and potentially cost-effective, to reach large numbers of people using ICTs in developing countries.
Currently, the evidence on physical activity and behavioural diet e-& mHealth interventions is largely drawn from reviews that did not include studies conducted in developing countries [21, 24, 25]. For example, a recent review on mHealth for the prevention of cardiovascular diseases, only retrieved studies conducted in developed countries . The same applies to reviews focusing on Internet [25, 26], social media , smart phone [28, 29], and mobile phone text messaging [30, 31] interventions to promote physical activity and healthy diets. Furthermore, a recent review focussing on mHealth interventions in patients with an NCD from developing countries identified only two studies that measured physical activity and none examined dietary behaviours . A systematic review of the research literature on physical activity and diet e-& mHealth interventions conducted in the developing world is currently lacking.
To address this gap, the objective of this systematic review was to investigate the effectiveness of e-& mHealth interventions to promote physical activity and healthy diets in developing countries.
This review was conducted and is reported according to the PRISMA guidelines  and the protocol can be retrieved from the PROSPERO database (Registration ID: CRD42015029240).
Study eligibility criteria
Studies were included if they a) quantitatively examined the effect of an e-& mHealth intervention on physical activity and/or diet outcomes; b) were conducted as a quasi-experimental trial, cross-over trial, controlled trial (CT), or randomized controlled trial (RCT); c) included participants from a developing country; and d) were published in English. Only studies in which the e-& mHealth component was the main or a major intervention delivery mode were included. E-& mHealth was defined as the use of ICT to promote physical activity and/or healthy diets. Interventions that were delivered via the Internet (webpages, social media, and email), mobile phone text messages or mobile phone calls, smartphone technology (‘apps’) and other wireless devices (e.g. wearable activity trackers, tablets) were included . The current World Bank classification (July 2015) was used to determine developing country status (low income, lower-middle income, and upper-middle income) . Studies were still included when they were simultaneously conducted in developing and developed countries [35–37]. Every search record was assessed against the inclusion criteria by one of the reviewers (AMM, SA, SS). In cases where study inclusion was unclear a decision was made via discussion including all reviewers.
The primary outcomes of this review were objectively or subjectively measured physical activity and/or dietary behaviour. This could be changes in physical activity levels, time spent doing physical activity, adherence to physical activity recommendations, energy expenditure, step counts, exercise/sport participation, active transport, sedentary time, accelerometer counts; food frequency, diet quality (as defined in the respective studies), fruit and vegetable intake, consumption of sweetened beverages and foods high in sugar, salt or saturated fat (or ultraprocessed foods), dairy product consumption, consumption of fat and dietary fibre, meal size, or caloric intake. Indirect calorimetry, body composition, BMI, body weight, waist circumference, waist-hip ratio, body fat, and lean body mass were reported if available, but only as secondary outcomes.
Information sources and search
A systematic search was performed in the following databases: Cochrane Central Register of Controlled Trials (CENTRAL) and the Health Technology Assessment Database (HTA; Cochrane Library), EBSCOHOST (including SPORTDiscuss, CINAHL, MEDLINE, PsycARTICLES, Psychology and Behavioral Science Collection), SCOPUS, Web of Science Core Collection and the World Health Organization Global Health Library. For each database, search terms were combined with the appropriate Boolean Operators: technology or email or internet etc. AND physical activity or exercise or walking etc. or healthy eating or nutrition or sugar intake etc. AND developing country or low-income country etc. or Afghanistan or Albania etc. The search period covered the date range 2000 to 31st October 2015 where available in the database. The data base search (Additional file 1 Cochrane Library) was piloted by the corresponding author and reviewed by all co-authors.
Additionally, articles were hand-searched in the grey literature and reference lists of relevant papers were reviewed. Moreover, the Johns Hopkins Global mHealth Initiative was contacted and a request for relevant studies was posted on ResearchGate (social media network for scientists) and created article alerts to derive 2016 articles outside the systematic search to be as current as possible (last inclusion was made in August 2016).
A data extraction form was developed based on previous reviews on physical activity and diet interventions [29, 30]. It was piloted on four studies by the corresponding author and refinements were made based on the feedback of the co-authors. Data on study setting/location and participants, e-& mHealth intervention characteristics and intervention effectiveness were retrieved. One reviewer extracted the relevant study information and a second reviewer assessed the data for accuracy and completeness. Disagreement between the reviewers was resolved through discussion and consensus with a third reviewer.
The risk of bias assessment was conducted independently by two reviewers using the CONSORT checklist (AMM, SA)  which has been used in previous e-& mHealth reviews . This checklist consists of 25 criteria. If a study fulfilled a criterion it received one point. Studies received half a point if it fulfilled one of two points making up a criterion. A higher overall score indicated lower methodological bias. The obtained risk of bias score of each study was divided by 25 (highest attainable score) and multiplied by 100 to obtain the percentage of fulfilled criteria. Disagreement between the reviewers was resolved through discussion and consensus with a third reviewer (SS). Studies were then grouped into low (>66.7 % fulfilled criteria), moderate (50–66.7 % fulfilled criteria) and high risk of bias (<50 % fulfilled criteria) [25, 39].
If available, changes in physical activity and diet between baseline and intervention completion, and between baseline and final follow-up (period following an intervention) were presented. If possible, effect sizes were reported or calculated (e.g., Cohen’s d, mean difference of change between groups), and confidence intervals and significance levels were presented. Where possible the between group effects were presented. The significance level was set to p ≤ .05.
As few studies provided data needed to calculate effects sizes and due to the great variability in study designs, interventions, and outcome measures conducting a meta-analysis was not possible.
A total of 5961 publications including 2231 duplicates were identified through the date base search. After screening the titles and abstracts of 3858 publications, the full-text of 31 publications was assessed for study eligibility. Of these, 10 publications were included in the review. Another six publications were identified through citation alerts and reference list checks. Finally, two publications reported on the same study [40, 41]. As such, a total of 16 publications describing 15 distinct studies were included in the current systematic review (Fig. 1).
Table 1 provides an overview of the study characteristics. The majority were RCTs (n = 8) with two (n = 7) [36, 40, 42–46] or three group study designs (n = 1) . The remaining seven studies were CTs (n = 3) [47–49] or quasi-experimental trials (n = 4) [37, 50–52]. The e-& mHealth interventions lasted between 1 and 24 months (median = 4 months, mean = 6.4 months). In eleven studies physical activity and/or diet outcomes were assessed only at baseline and immediately after the e-& mHealth intervention [35–37, 40, 42, 45, 47–49, 51, 52]. Three studies also conducted follow-up assessments after intervention conclusion (3-month follow-up for all 3 studies) [44, 46, 50] and in one study, physical activity and diet outcomes were assessed at baseline, during the intervention and at intervention completion .
One study was conducted in Europe (Turkey) , one in Africa (South Africa) , three in Latin-or South America (Mexico, Brazil, Peru, and Guatemala) [35, 36, 48], nine in Asia (India, Iran, China, Philippines, Thailand, Pakistan, and Malaysia) [40, 42–47, 49, 51] and one across a large number of countries . Rubinstein et al.  conducted their study in Peru, Guatemala and Argentina, Lana et al.  in Spain and Mexico, and Ganesan et al.,  included participants from 64 countries with 92 % from a developing country (mainly India). The number of participants ranged from 22  to 69219  with four trials enrolling less than 100 participants [46, 47, 50, 52]. In total 75930 people participated in all included studies. Fourteen studies enrolled adults over 18 years of age (range = 18 to 74 years), and one study recruited children and adolescents . Study participants were healthy or at risk of developing diabetes or hypertension (n = 10 studies) [35–37, 40, 44, 46, 48, 49, 51, 52] or diabetic (n = 5 studies) [42, 43, 45, 47, 50]. Three studies enrolled only women [44, 50, 52] and one enrolled only men .
The e-& mHealth interventions were delivered via mobile phone text messages (n = 7 studies) [36, 40, 42, 43, 46, 49, 50], the Internet including websites and email (n = 6 studies) [35, 37, 44, 48, 51, 52], a website plus mobile phone text messages (n = 1) , mobile phone calls (n = 2) [45, 47], or mobile phone calls plus text messages (n = 1) . In eight studies, limited face-to-face contact or printed media were also part of the e-& mHealth intervention [36, 40, 42, 43, 45, 46, 50, 51]. All studies provided information on the intensity of the e-& mHealth intervention. For example, in studies that used mobile phone text-messages as intervention delivery channel text-messaging frequency ranged from twice weekly to daily (mean = 4.5 text messages per week). Only five studies were theoretically framed [35, 36, 40, 44, 48] with the Transtheoretical Model of Behavior Change most frequently applied (n = 3 studies) [35, 36, 40]. However, in other interventions behaviour change techniques (BCTs) such as goal setting and self-monitoring were used to promote physical activity and healthy diets.
Both physical activity and diet outcomes were assessed in the majority of studies (n = 10) [35, 36, 40, 42, 43, 45, 47, 49, 51, 52] while four assessed only physical activity [37, 44, 46, 50] and one only diet . Physical activity was assessed in various ways, however most studies used a self-report instrument including questionnaires, interviews and exercise diaries (n = 10) [35, 36, 40, 42, 43, 46, 47, 49, 51, 52]. The outcomes also varied greatly across studies: adherence to physical activity guidelines, time spent being active, physical activity-related energy expenditure, physical activity score, and exercise frequency. In one study step-count data were collected with a pedometer  while Sriramatr et al.  and Ganesan et al.  used both pedometer data and a questionnaire. Diet outcomes were only assessed subjectively via questionnaires, 24-h recall sheets and interviews. One study did not report how outcome data was assessed . Secondary outcomes were assessed in ten studies [35–37, 40, 42, 43, 45, 46, 50, 51]. All these studies reported data on BMI and six studies also reported on waist circumference and/or body weight.
Risk of bias within studies
The detailed CONSORT risk of bias assessment of the individual studies is presented in Additional file 2. On average the studies fulfilled 55.7 % of the assessment criteria (range = 28–88 %). Hence, overall the studies had a moderate risk of bias with just over half of the studies at high risk (n = 8 studies) [37, 42, 44, 45, 48, 50–52]. Few studies provided adequate information on intervention harms (n = 2) [40, 46], study protocol publication (n = 3) [35, 36, 51], study registration (n = 6) [35–37, 40, 46, 49], ancillary analyses (n = 5) [35–37, 40, 50], and randomization as well as blinding (n = 4) [36, 40, 43, 46].
Of the 15 studies included, four reported no significant positive effects on either physical activity or diet outcomes following an e-& mHealth intervention [35, 42, 47, 50]. The majority of studies (n = 11) reported at least one significant positive effect on physical activity or diet outcomes (Table 2). No clear patterns emerged between those studies that were effective and those that were not. In terms of secondary outcomes BMI was measured in nine studies with two reporting a significant positive effect of an e-& mHealth intervention despite not focussing on weight loss [36, 51].
Promoting healthy lifestyles is an effective public health strategy to address the NCD rise in developing countries . Given the great proliferation of ICT in developing countries, the use of e-& mHealth approaches appear to be viable to promote physical activity and healthy diets [21–23]. The results of this systematic review suggest that e-& mHealth interventions can be effective in improving physical activity and diet quality in developing countries. Overall, this review showed that 50 % of the e-& mHealth interventions were effective in increasing physical activity, and 70 % of the identified interventions were effective in improving diet quality. This result is consistent with the findings from previous systematic reviews of e-and mHealth interventions conducted in developed countries [21, 24–26, 29, 31, 53–55]. The findings from this review also add to the overall evidence on the effectiveness of e-& mHealth interventions in developing countries that were conducted to assess other health outcomes (e.g., treatment adherence) [32, 56–61]. As the included studies used multiple intervention components, it was not possible to identify which specific components were associated with interventions effectiveness. However, most Internet-based interventions were effective in improving physical activity and/or diet while the evidence for mobile-phone interventions (text messages and counselling) was mixed.
The overall risk of bias of the included studies was moderate with just over half of the studies having a high risk of bias. Study quality or study bias are also a concern in studies conducted in developed countries. Most previous reviews on the effectiveness of e-& mHealth interventions to promote physical activity and healthy diets in developed countries reported that the included studies were of low to moderate quality or rather biased [28, 30, 55, 62, 63]. There was no association between the risk of bias score and the effectiveness of the e-& mHealth interventions. The four studies with the lowest risk of bias reported mixed results [35, 36, 40, 46] and the same is true for the studies with higher risk of bias.
Importantly, the majority of studies included in this review (n = 10) examined an intervention modality that is likely economically viable and has the potential to reach large numbers of people to address the steep increase of NCDs. While more high-quality RCTs are needed to broaden the evidence-base, it is also important to conduct real-life implementation studies, given that the majority of the included studies reported that the e-& mHealth interventions showed positive outcomes. The study by Ganesan et al.  provides an insightful example of real-life implementation of a low-cost e-& mHealth intervention to increase physical activity. The researchers included almost 70000 participants (92 % from developing countries) into their 100-day Stepathlon programme and found that daily step counts and weekly exercise participation increased greatly. This study was possible because academic researchers teamed up with the private sector and formed a strong collaborative network. To form academic-private partnerships in order to either conduct or upscale e-& mHealth interventions to increase physical activity and improve diet quality might also be an option for researchers in other developing countries. Benefits of such partnerships include sharing of expertise (academia: behavioural health knowledge, industry: intervention appeal and dissemination expertise) and data sharing which can lead to dynamic intervention development and adaptation . Potential for such partnerships is especially high in countries where there is some preliminary evidence that such interventions are feasible. Feasibility information is available from Malaysia [65–67], Iraq , Pakistan  and South Africa  where the e-& mHealth interventions were well accepted and study participants found them useful.
A key strength of this review is that this is the first systematic review to investigate the effectiveness of e-& mHealth interventions to promote physical activity and healthy diets in developing countries. A further strength is that a large number of information sources were systematically searched to identify relevant studies and that the search was updated continuously (until August 2016). Additionally, data of the included studies were extracted in great detail despite the complex nature of some studies and large variations across studies.
A limitation of this review is that only articles published in English were included. Studies conducted in developing countries where English is not the first language might have been published in local languages and our search would not have identified them. The possibility of publication bias should also be acknowledged. As with all systematic reviews examining the efficacy of interventions, it is possible that some studies that did not find a beneficial effect of an e-& mHealth intervention have not been published .
Further, studies were only identified in a small number of countries and it is therefore difficult to generalize the review findings across developing countries (most studies were available from Asia). Additionally, most studies were conducted in upper-middle income countries (n = 10) and none in a low income country.
Due to the differences in study designs, outcome measures, lengths of studies, and study samples it was difficult to draw clear conclusions in this review. It is therefore important that researchers aim to examine the impact of e-& mHealth interventions to promote physical activity and healthy diets in a standardized manner. Applying the CONSORT guidelines that specifically highlight the importance of valid controls is strongly encouraged . This will allow for a pooling of results to conduct a meta-analysis, and would reduce the risk of bias in the included studies.
Researchers should be encouraged to assess and report data on intervention acceptability and level of participation (as measured through web and app usage tracking). Only a limited number of studies included in this review presented this information. Knowing how well participants accept and are engaged in e-& mHealth interventions is essential because acceptability and user engagement are related to intervention effectiveness [72, 73]. Additionally, studies examining the cost-effectiveness and reach of e-& mHealth interventions in developing countries are currently lacking. These studies are needed to ensure that resource poor countries can impact health behaviours in a large number of people at an affordable cost. From this review, the impact of behavioural e-& mHealth interventions a) on clinical health outcomes and b) among patients versus non-patients is unclear and more research is warranted.
Finally, while behavioural e-& mHealth research in developed countries is well established , research in developing countries is only in its infancy. One indication for this is the small number of studies that were identified. In addition, the studies included in this review utilized mainly first generation technologies of the Internet and mobile phones to implement their interventions (n = 14). However, with the unprecedented expansion of mobile broadband in developing countries, e-& mHealth interventions with advanced technologies (e.g. smart phone apps and wearable activity trackers)  are likely to emerge . One feasibility study conducted in South Africa already reported that a diet smartphone app for diabetic nephropathy patients is highly acceptable among dietitians . It is important that researchers examine if these advanced technologies can be leveraged to promote physical activity and healthy diets in developing countries.
In summary, using e-& mHealth approaches to promote physical activity and healthy diets in developing countries was effective in most studies included in this review. However, the interventions varied greatly in terms of geographic spread, intervention components evaluated, trial methods applied and study quality. Therefore, the findings from the included studies should be interpreted with caution, and more rigorous study designs are recommended for future e-& mHealth interventions.
Body mass index
Consolidated Standards of Reporting Trials
- e-& mHealth:
Electronic and mobile health
Information and communication technology
Metabolic Equivalent of task
Preferred reporting items for systematic reviews and meta-analyses
Randomized controlled trial
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CV was supported by a Future Leader Fellowship from the National Heart Foundation of Australia (ID 100427). The funder had no role in any part of the study.
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AMM developed the concept and design of the study, provided the systematic literature research and drafted the manuscript. AMM, SS and SA extracted the data and rated the risk of bias of individual studies. AMM, SS, SA and CV contributed to the development of the study protocol, interpretation of the data and provided critical revisions to the manuscript. All authors have read and approved the final manuscript.
The authors declare that they have no competing interests.
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Müller, A.M., Alley, S., Schoeppe, S. et al. The effectiveness of e-& mHealth interventions to promote physical activity and healthy diets in developing countries: A systematic review. Int J Behav Nutr Phys Act 13, 109 (2016). https://doi.org/10.1186/s12966-016-0434-2