Clinical trial NCT04526847: Intermittent Fasting Compared to Continuous Energy Restriction on Body Weight Loss
Official title: Effectiveness of Intermittent Fasting Compared to Continuous Energy Restriction on Body Weight Loss Among Overweight/Obese Adults: a Randomized Controlled Trial
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Overweight and Obesity
Keywords: Intermittent fasting
energy restriction
weight loss
cardiometabolic risk markers
Nepal
Lead sponsor: Armed Police Force Hospital, Nepal
Sponsor class: OTHER_GOV
First posted: 2020-08-26
Enrollment: 112
Sex: ALL
Minimum age (years): 18
Maximum age (years): 64
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: The proposed study is a parallel arm, randomized controlled trial compare two different dietary patterns: 1) intermittent energy-restriction (IER) diet also known as intermittent fasting (5:2 eating pattern: 5 days of habitual intake and 2 very low energy diet on two non-consecutive days (Mondays and Thursdays) per week, and 2) Continuous (daily) energy-restricted diet (CER) on the reduction of body weight, and cardiometabolic risk factors among overweight/obese Nepalese population (Figure 2). This study will adopt a parallel randomized trial design with an equal allocation of participants between the IER and CER arm. The participants will be recruited from the general population through social media advertisements. The study will be carried out for six months, from baseline data collection, follow-up midline data collection, and end-line data collection for outcome measure.
Primary purpose: SUPPORTIVE_CARE

Brief summary: Obesity remains a major public health challenge. Intermittent fasting continues to gain popularity compared to continuous energy restriction as a weight-loss approach for cardiometabolic health. Studies to date comparing intermittent energy restriction (IER) and continuous energy restriction (CER) have not been investigated on weight loss and cardiometabolic risk markers in low-income countries like Nepal. The main objective of this study is to compare the effectiveness of IER versus CER diet on weight loss and cardiometabolic risk markers over the course of six months among overweight/obese Nepalese population.

This study will adopt a parallel arm, open-label, randomized control trial design. The study duration will be six months from baseline to endline. A total of 112 overweight and obese participants, aged 18-64 years, with waist circumference \>90 cm (men) and \>80 cm (women) will be enrolled in the study. Interested participants will be approached through social media and consecutively enrolled and assigned to either IER group (n=56) or CER group (n=56) randomly. Participants will be provided Mediterranean pattern dietary intervention including two groups: IER group will receive 5:2 diet pattern (5 day without energy restriction and 2 days with 75% energy restriction, net weekly energy deficit \~25%), and CER group with a low-calorie diet (daily energy deficit \~25%) over the course of six months. Both IER and CER group will be provided personalized diet plan, portion size, nutrition counseling focus on dietary guidance, motivational strategies, and personal goal setting for behavior change with educational materials. Baseline data will be collected using a structured questionnaire and the biochemical tests will be done. Baseline data will be collected at the time of enrollment, midline in three months, and end-line data collection in six months. The primary outcome of this study will be the change in weight loss between IER and CER groups. The secondary outcome measure will be to evaluate changes in nutritional composition, eating behavior, and cardiometabolic risk markers between IER and CER group over six months. Data will be entered using Epidata Software and transferred to the Stata/MP version 14.1 for further analysis. Data will be analyzed using an intention-to-treat basis. Independent t-test and, repeated measures ANOVA will be used to estimate changes between-group comparisons. The significance level will be assumed at p\<0.05

Detailed description: Overweight and obesity remain a major chronic health problem globally. The development of overweight and obesity is associated with various comorbidities including cardiovascular disease (CVD), dyslipidemia, hypertension, insulin resistance, certain cancers, and sleep apnea. Obesity is a strong modifiable risk factor for CVD, the leading cause of death worldwide. Dietary management is a cornerstone in the prevention, treatment, and control of overweight and obesity, CVD, and metabolic risk factors. Healthy dietary habits reduce the risk of several chronic lifestyle-related diseases as well as meet the demand for essential nutrients to the body to keep healthy.

Many dietary guidelines for the management of overweight and obesity in the general population recommended the reduction of body weight through calorie restriction, increase energy expenditure or followed both approaches. The most common method of weight loss has been daily, or continuous energy restriction (CER), which involves individuals restricting their energy restriction on daily basis by anywhere between 15-60%. Although CER is the most widely recommended calorie restriction approach for body weight loss and prevention of overweight and obesity, recent years have seen a surge in popularity of eating patterns including intermittent energy restriction (IER) as an alternative to CER due to its less restrictive nature and potential for higher rates of adherence. IER is an alternative weight loss method that may prove useful for individuals who find continued energy restriction difficult to maintain. Recent studies have shown IER to be comparable to CER in achieving weight loss in overweight and obese populations with the mean weight loss being 3-5 kg over 20 weeks. IER is considered to be effective for the management of obesity because IER requires the individual to focus on the energy-restricted for defined days during the week which is potentially more feasible than the standard approach of CER which is associated with poor compliance, and IER diet pattern have many beneficial metabolic effects achieved with weight loss and energy restriction when the person is no undergo negative energy balance.

Many peoples are worried about their increased body weight due to obesity-related adverse outcomes including coronary heart disease, type 2 diabetes, and metabolic disorder. There is a knowledge gap of evidence-based dietary patterns used for weight loss diet plan in the Nepalese context. The effectiveness IER using a 2-day severe energy-restricted strategy with 5 days of habitual eating pattern compared to CER has not been yet investigated within the Nepalese population. Therefore, the investigators intended to investigate the effectiveness of an IER diet using 2-day severe energy-restricted with 5 days of habitual eating pattern compared to a CER diet over six months.

Eligibility criteria: Inclusion Criteria:

* Men and women aged 18 years or above with body mass index (BMI) \>25 kg/m2
* Those who give consent to participate in our intervention study

Exclusion Criteria:

* Those who are pregnant women, lactating women, or planning to become pregnant during the course of study.
* Those who are severely ill or more than two comorbidities such as major psychiatric disorders, previous gastric surgery, haematological disorders, insomnia, acute excerabation of chronic obstructive pulmonary disease, asthma, respiratorty tract infections, and diabetes patients if treated with insulin or hypoglycemic agents.
* Those who have any plan to migrate from the study area for at least three months
* Use of anti-obesity drugs or other drugs affecting body weight
* Eating disorder, alcohol or drug abuse that could contribute to difficulties with study procedures

Primary outcomes:
measure: Change in Body weight
timeFrame: 3 months
Secondary outcomes:
Other outcomes:
Locations:
city: Kathmandu
country: Nepal
facility: Dev Ram Sunuwar
state: Bagmati
Study officials:
References:
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