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Retention, Fasting Patterns, and Weight Loss With an Intermittent Fasting App: Large-Scale, 52-Week Observational

Luisa Torres1, Joy L Lee2,3, Seho Park2,3

  • 1LifeOmic, Indianapolis, IN, United States.

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Summary

Intermittent fasting (IF) via mobile apps is effective for weight loss in overweight and obese individuals. Higher fasting hours correlate with greater weight reduction, showing IF

Keywords:
diet trackersintermittent fastingmobile appsobesityretentiontime-restricted eatingweight loss

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Area of Science:

  • Nutrition Science
  • Digital Health
  • Weight Management

Background:

  • Intermittent fasting (IF) is a dietary approach focusing on eating timing, gaining popularity for weight and health improvements.
  • Mobile apps are widely used by IF practitioners for tracking fasts, adherence, and monitoring biometrics.

Purpose of the Study:

  • To quantify user retention, fasting patterns, and weight loss among users of two IF mobile apps.
  • To identify demographic and behavioral factors correlating with retention and weight change in IF app users.

Main Methods:

  • Assembled data from 792,692 adult users of LIFE Fasting Tracker and LIFE Extend apps (2018-2020).
  • Quantified retention up to 52 weeks using Cox proportional hazards regression.
  • Analyzed weight loss in 161,346 users using linear regression, defining fasting as extended fasting hours (EFH) per day.

Main Results:

  • Retention at 52 weeks was 2.1%; retention positively associated with age and exercise, negatively with stress and smoking.
  • Weight loss strongly correlated with starting BMI and EFH per day; users with BMI ≥40 kg/m² lost 13.9% of body weight by 52 weeks.
  • EFH per day predicted weight loss linearly, averaging over 1% of starting weight loss per EFH per day by week 26.

Conclusions:

  • Intermittent fasting using mobile apps is a sustainable weight reduction strategy for overweight and obese individuals.
  • Healthy weight and underweight individuals show minimal weight loss, irrespective of fasting duration.
  • Obese users experience significant weight loss, with greater loss observed in those engaging in more extensive fasting.