Metabolic syndrome (MetS), also known as “Syndrome X,” poses a growing threat to public health. By 2020, cardiovascular diseases (CVDs) are projected to be the leading cause of death and disability in India, with 2.6 million deaths expected [1]. Meanwhile, stroke, a major contributor to CVD, is projected to increase to 894 per 100,000 people [2]. MetS is characterized by a cluster of metabolic factors including high blood pressure, impaired glucose tolerance or diabetes, and dyslipidemia (elevated levels of triglycerides and low concentration of high-density lipoproteins) marked by the presence of abdominal obesity [3]. The specific etiology of MetS remains unclear, but the interplay between genetic, behavioral, clinical, and environmental factors such as urbanization, mechanization, and rural-to-urban migration play an important role in its etiology [1,3-5].

Although there are numerous studies on the effects of health interventions for nutrition and physical activity on a single risk factor such as obesity, CVD, and diabetes [6,7], there have been no studies evaluating the impact of multifactorial interventions. The role of social determinants of health in reducing the burden of MetS has not been considered in these studies. As preventive measures, changes through intervention in dietary habits and physical activity are key lifestyle changes recommended by medical literature [8-10]. Despite increased public awareness about noncommunicable diseases (NCDs), the burden of NCDs has not decreased.

The individual behaviors of residents of urban, low-income settings in their environment are crucial in understanding the causes of NCDs and cannot be tackled through policy recommendations based on lumped quantitative data alone. Such methods ignore the interplay of culture, politics, poverty, economics, and actions in urban, low-income conditions and the role of the Sustainable Development Goals [11]. Given the concentration of health programs and policy resources in cities, it is assumed that city inhabitants have more access to services like rehabilitation and health care, and that people with low income living in cities are thus better off than their rural counterparts. This is where the vulnerability of individuals residing in urban, low-income settings arises; the issue of equality becomes critical for urban individuals with low income, who face complicated and debilitating issues such as the inability to pay for products and services, and a lack of social support structures. Urban individuals with low income also have economic hurdles when it comes to making healthier dietary decisions. The accessibility, availability, and affordability of ultraprocessed, high-sugar, high-fat foods in contrast to fresh fruits, vegetables, and meat lead to a high risk for MetS. A few barriers to telehealth interventions identified in the Indian context stand true for urban, low-income populations, such as the digital divide, language barriers, perceived usefulness or preference for face-to-face consultation, perceived ease of use, etc [12]. Food environments, food security, sanitation and hygiene, clean drinking water, etc, are contributing factors to MetS among those residing in urban, low-income settings [13,14].

Prior studies found that individuals treated for diabetes or hypertension only often received medications and do not adopt lifestyle changes such as consuming a healthier diet and increasing physical activity [15]. There is a dearth of effective intervention models that are feasible in Indian, rural, low-resource settings, which face significant challenges owing to poverty, low literacy, and gender norms [16]. Interventions to address social, behavioral, and environmental determinants of MetS and cardiometabolic disorders are less developed [17]. Hence, the creation of science-based, behavior-focused, context-specific, and culturally relevant interventions that take into account the social determinants of health is the solution to address the burden of MetS. Therefore, the proposed study aims to fill existing gaps in understanding how cardiometabolic and environmental factors interact and influence the self-management of MetS among urban, low-income populations.

This study aims to design, develop, and pilot-test an interactive, tailored, internet- and mobile-enabled health intervention to enhance the self-management of MetS among individuals living in urban, low-income settings.

The study aims to fulfill the following 3 objectives:

To achieve objective 1, a mixed method approach comprising qualitative and quantitative assessments will be used to develop a model that will describe the interplay between the living environment and other cardiometabolic risk factors such as diet, physical activity, stress, and sleep. In-depth interviews will be conducted among a sample population of 120 participants enrolled from urban, low-income settings across 4 zones of New Delhi (North, South, East, and West).

To achieve objective 2, a quasi-experimental study design will be used with a sample of 80 participants, using a human-centered approach to design and develop an interactive, tailored, mobile- and internet-enabled digital health intervention. The findings of objective 1 will help define the essential elements and features of the proposed digital health intervention.

Objective 3 of the study will be to pilot-test the utility and feasibility of the proposed digital health intervention and to measure usage, adherence, satisfaction, and acceptance regarding the proposed digital health intervention. For this, a sample size of 30 people will be enrolled from each of the 8 urban, low-income areas (240 participants) of New Delhi. The methodology is presented graphically in Figure 1.

Eligible participants will include adults (aged 18 years and older) who provided informed consent, have an Android phone, are willing to use technology, are available for follow-up interviews, and have been diagnosed with MetS (presence of 3 of the 5 risk factors of MetS). Individuals who are aged <18 years; have a terminal illness, impaired cognition, presence of coexisting illness documented in the medical record (type 1 diabetes), or self-reported systemic inflammation (eg, rheumatoid arthritis or acute systemic infection); are pregnant or lactating; are involved in other clinical trials or protocols related to MetS; or fail to adhere to study procedures (eg, scheduled surgery, travel plans, or scheduling difficulties that do not permit full participation) will be excluded from the study.

The full text of the survey instrument is presented in Multimedia Appendix 1.

The gathered variable outcome data will be checked for inconsistencies or missing values and will be confidentially stored and retrieved for analysis. The qualitative (in-depth interviews) data will be analyzed by content analyses. Descriptive analyses will report the means and SDs of the data results. 2-tailed t tests will be used to compare the means between categorical and continuous variables. Chi-square analysis will be used to analyze categorical variables. Univariate and bivariate analyses of independent variables will be done. Reporting of results will be done at 95% CI, and P<.05 used.

The detailed project timeline and schedule corresponding to the study objectives are presented in Table 1.

Data collection and entry will be done by trained field staff following standard techniques and protocols. Training sessions for the field workers will be held to acquaint the data collection team with the study aim, objectives, study area, and inclusion/exclusion criteria. Information will also be given for study instruments, anthropometric data collection, in-depth interviews (engagement with the respondent and probing), and informed consent (for data collection, audio recording, and pictures). To ensure efficiency and high-quality data collection and processing, weekly meetings with the field and research staff will be held. A log of all data collected will be maintained, and weekly data checks will be done.

The study was approved by the Indian Council of Medical Research—National Institute of Pathology Institutional Human Ethics Committee in January 2022 (approval NIP-IEC/29-12-2021/05/01R1). The study will be conducted according to the Declaration of Helsinki, as it involves human participants [19]. Written informed consent to participate in the study will be obtained from each of the selected participants. Audio recording of consent will be done for individuals with limited education. Complete data confidentiality and anonymity of study participants will be ensured. Study consent will be available in English and a local Indian dialect. Data will be collected by trained data collectors electronically using tablet computers and saved on the servers.

The study outcomes include the enhancement of self-management of MetS among individuals living in urban and low-income slum settings. The study will identify influencing risk factors on MetS and examine the role of digital interventions to address the risks. The authors also expect the study to increase self-efficacy and the knowledge, attitudes, and practices related to self-management of diabetes, hypertension, and other risk factors of MetS among individuals living in urban, low-income settings. The study results will be disseminated at various levels, including scientific journal publications, conference proceedings, etc.