Association Between Monetary Deposits and Weight Loss in Online Commitment Contracts.

Area of Science:

• Behavioral economics
• Health psychology
• Digital health interventions

Background:

• Weight management remains a significant public health challenge.
• Online platforms offer scalable solutions for behavior change.
• Commitment contracts, leveraging psychological principles, are explored for efficacy.

Purpose of the Study:

• To investigate the characteristics of voluntary online commitment contracts associated with enhanced weight loss.
• To determine if monetary incentives influence the effectiveness of weight loss contracts.

Main Methods:

• Retrospective analysis of 3,857 voluntary online weight loss commitment contracts from 2013.
• Regression analysis to compare weight loss between incentivized (monetary deposits) and non-incentivized contracts.
• Examination of deposit types: charity, anti-charity, or friend.

Main Results:

• Contracts with monetary incentives (anti-charity, charity, friend deposits) showed significantly greater weight loss than non-incentivized contracts (P < 0.001).
• Weekly weight change was -0.33% for anti-charity, -0.28% for charity, and -0.25% for friend deposits.
• Contracts lacking weight verification reported higher weight loss, suggesting potential self-reporting bias.

Conclusions:

• Voluntary online commitment contracts with monetary incentives appear effective for weight loss.
• The enhanced weight loss may be attributed to the incentives themselves or pre-existing higher participant motivation.
• Further research is needed to disentangle the precise mechanisms driving these results.