Food and Behaviour Research

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Quitting junk food produces similar withdrawal-type symptoms as drug addiction

University of Michigan


Trying to give up junk food can result in similar withdrawal-type symptoms to those of addicts attempting to quit using drugs. A new study evaluates the withdrawal symptoms people experience when giving up highly processed foods such as pastries, chips and pizza.


This study adds to the substantial evidence showing that for many people, ultra-processed, or 'junk' foods are effectively addictive.

The very concept of 'addiction' is a complex one - as the distinctions between physical and psychological components are not always clear cut.  However, negative 'withdrawal effects' from trying to reduce intake - such as anxiety, headaches, irritability, and low or unstable mood - are a key feature of 'classic' addictions to substances like tobacco, drugs or alcohol.

This study shows that similar negative withdrawal effects are often experienced when people cut their consumption of ultra-processed foods, and on a similar time-scale.

In 231 adults, self-reported withdrawal symptoms after quitting junk food included sadness, irritability, tiredness and cravings, which typically reached a peak after 2-5 days, before tapering off.

As the authors note, these kinds of symptoms help to explain why dietary changes can be so difficult to maintain - especially when ultra-processed foods and drinks are now so difficult to avoid - and they have obvious relevance to the difficulties of managing both obesity and other eating disorders.

These findings add more weight to the case for better regulation and/or taxes to be applied to ultra-processed foods and drinks that have minimal nutritional value - i.e. for these to be treated in a similar way to alcohol, tobacco and other addictive substances. 

For more details of this research, see:

If you plan to try and quit junk food, expect to suffer similar withdrawal-type symptoms—at least during the initial week—like addicts experience when they attempt to quit using drugs.

A new study by University of Michigan is believed to be the first of its kind to evaluate withdrawal symptoms people incur when they stop devouring highly processed foods, such as pastries, French fries and pizza.

Previous studies have focused on sugar withdrawal among animals and the literature regarding humans offered only anecdotal evidence, said Erica Schulte, the study's lead author and U-M psychology doctoral candidate.

What all researchers can agree upon is that the addictive qualities of tobacco, drugs or alcohol affect the brain similarly and cutting back can lead to negative side effects that can make it difficult to reduce intake. Anxiety, headaches, irritability and depression are some of those outcomes.

Understanding whether withdrawal may also occur with highly processed foods was an essential next step in evaluating whether these foods might be capable of triggering similar addictive processes.

Schulte and colleagues created the first self-report tool to measure the physical and psychological withdrawal symptoms among people, then asked 231 adults to report what happened when they reduced the amount of highly processed foods they ate in the past year.

The participants reported that sadness, irritability, tiredness and cravings peaked during the initial two to five days after they quit eating junk food, then the negative side effects tapered off, which parallels the time course of drug withdrawal symptoms, the study found.

The U-M researchers did not focus on the method used to change their eating behavior, such as participants quitting "cold turkey" or gradually phasing out junk food. Schulte said future studies will analyze the behavior in real time rather than a retrospective approach as in the current findings.

The study implications suggest that withdrawal symptoms may make dietary changes challenging, which may contribute to people reverting back to bad eating habits, said Ashley Gearhardt, associate professor of psychology and co-author, along with U-M graduates Julia Smeal and Jessi Lewis.