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Diets donât work. Studies show that temporary fixes to old habits actually make people gain weight. Essentially, the dieterâs brain is trained to gorge when off the diet and inevitably the weight returns.
In my previous essay, I shared the story of my fatherâs struggle with bad eating habits. He had put on weight over the last few decades and despite several attempts, he had trouble taking it off. In his late 60s he faces pre-diabetes and a daily ritual of taking a handful of pills.
But over the last five months, something has changed. Heâs found a new way to resist the temptation of the food heâs been trying to stop eating for years.
We Took a Bet
In my last article, I shared that my father and I shook on a $25,000 wager that binds him to never eat refined carbohydrates againâââno processed sugars, no processed grains. Many people are shocked by the dollar amount of the bet but thatâs missing the point. My objective is to never win the money. The bet just has to create a moment of consequence to disrupt the current habit with an amount large enough to be meaningful.
So far itâs working. My father has lost about 2 pounds per week and his improved blood work convinced his doctor to take him off some of the meds.
Why it Works
Admittedly, my father is just one person. His story provides little more than anecdotal evidence. However, a recent study published in the New England Journal of Medicine provides some supporting evidence that putting some skin in the game makes people more likely to accomplish their goal of stopping a bad habit.
The study followed three groups of people trying to quit smoking. The control group was offered information and traditional methods for smoking cessation like free nicotine patches. After 6 months, 6% of the people in this group stopped smoking. The next group, called the ârewardâ group, was offered $800 if they were smoke-free at 6 months. Of those, 17% quit. From just these two groups, we see paying people does indeed provide an incentive to stop a bad habit, at least short term.
However, the third group provided the most interesting results. In this group, called the âdepositâ group, participants were asked to put down $150 of their own money, which they would receive back if they successfully quit in 6 months. In addition, they were given a $650 bonus prize from their employer if they quit. Of those who accepted the deposit challenge 52% succeeded.
On the surface, this makes no sense. Why would winning $800 be less effective than winning only $650 plus $150 of your own money back?
Perhaps people in the deposit group were more motivated to quit smoking in the first place? The researchers admitted that over 85% of people who were offered the deposit deal refused to take it. However, the study authors took efforts to scrub the effect of extra motivation by only using data from smokers willing to be in either group.
Loss Aversion, Commitment, and a Social Out
So what else might explain the results? For one, the study authors write, âpeople are typically more motivated to avoid losses than to seek gains.â This irrational tendency, known as âloss aversion,â is a cornerstone of behavioral economics. As Nudge author Cass Sunstein, wrote, âa 5-cent tax on the use of a grocery bag is likely to have a much greater effect than a 5-cent bonus for bringing oneâs own bag.â
There are other factors at work as well. Commitment contractsâââlike putting money down or taking a betâââhave proven to be effective at changing behavior because they make us accountable to our future selves. People are notoriously bad at predicting their behavior due to a phenomenon called âtime inconsistency.â Essentially, we punt difficult to do behaviors saying, weâll âeat better tomorrowâ or weâll âclean the garageâ next weekend.
Tim Urban, author of the Wait But Why blog, explains his struggle with procrastination writing, âI banked on Future Timâs real-world existence for my most important plans, but every time Iâd finally arrive at a time when I thought I would find Future Tim, he was nowhere to be foundâââthe only person there would be stupid Present Tim. Thatâs the thing that really sucks about Future Youâââwhenever time finally gets to him, heâs not Future You anymore, heâs Present You, and Present You canât do the tasks you assigned to Future You ⊠So you do what you always doâââyou re-delegate them to Future You, hoping that next time time catches up with Future You, he actually exists.â
By creating a binding commitmentâââlike the $25,000 bet my father took with meâââwe make sure our future selves behave in line with our present goals. A website called stickK.com uses commitment contracts to help itsâ users accomplish their goals. People sign legally binding agreements where they have to pay a third party if they donât meet their obligations to stop smoking, exercise, or finish their novel, for example. The site, founded by two Yale professors, has proven effective for those brave enough to take the bet.
Thereâs one more important and often overlooked reason these types of commitments workâââthey change the language we use. When I asked my father how he manages the temptation to not cheat with just a bite of cake now and then, he told me, âI just donât. Itâs actually not a big deal any more.â Frankly, I was surprised he is having such an easy time with it. Hereâs a man who has struggled with his weight for over 30 years but who suddenly finds giving up some of his favorite foods to be, well, a piece of cake. What gives?
It turns out that the way we describe our behaviors can have a dramatic impact on what we will and wonât do. A study in the Journal of Consumer Research found that people who were prompted to use the words âI donâtâ versus âI canâtâ were nearly twice as likely to resist the temptation of choosing unhealthy foods. The researchers believe using âI donâtâ rather than âI canâtâ gave people greater âpsychological empowermentâ by removing the need to make a decision. âI donâtâ is outside our control while âI canâtâ is self-imposed.
Now when my father goes out to lunch with his friends and dessert is brought to the table, he has a story to tell. âWhen they offer me a bite, I let them know it would be a very expensive mouthful,â he said. âI explain I just donât eat that stuff anymore because the bet I made is for life.â He explains, âWhen I tried to lose weight before, I had to explain to people that I was on a diet. Eventually, I would get tired of saying âI canâtâ and Iâd cave-in and tell myself, âjust this once.â But now with this bet,â my father joked, âI can just blame you!â
Hereâs the gist:
â Creating a commitment to stop a bad habit can increase the odds of quitting certain behaviors.
â Though not appropriate for all behaviors (Iâll discuss the limitations in my next essay), the technique works because it uses loss aversion, a commitment contract, and provides a social out for not doing the behavior by changing the language we use to describe our actions.
Photo credit: nerissa's ring
Originally published at www.nirandfar.com on May 26, 2015.
The Behavioral Economics Diet: The Science of Killing a Bad Habit
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Nir Eyal is the author of Hooked: How to Build Habit-Forming Products and blogs at NirAndFar.com. For more insights on using psychology to change behavior, join his newsletter and receive Nirâs free list of research-backed tips and tricks to increase your personal productivity.
Applying Behavioral Economics Diet to Kill a Bad Habit was originally published in Hacker Noon on Medium, where people are continuing the conversation by highlighting and responding to this story.
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