When you’re full after a big meal but still reach for a bag of chips or a box of cookies, you might blame it on a lack of willpower. But a new study suggests it could be due to how your brain responds to snacks, whether or not you’re hungry.
In the study, published in the journal Appetite in March 2026, researchers measured people’s brainwaves after eating and found that despite being full, they still responded to tempting food cues, such as chips, chocolate and popcorn.
“Cues are huge,” Thomas Sambrook, the study’s lead author and a psychology lecturer at the University of East Anglia in Norwich, England, told HuffPost. We live in an environment where “we are bombarded with signals that indicate the nearby availability of tasty food that’s going to make us happy momentarily,” he said, and the brain may respond to this constant exposure by forming habits that tell you to eat when you’re not hungry.
So does that mean snacking is an automatic brain response that’s beyond your control? Here’s what to know about why we snack and how to break over-snacking habits.
What happens in the brain when you snack?
In the study, electroencephalogram (EEG) brain scans monitored 76 hungry people as they played a reward-based game with savory and sweet foods, including cheese-flavored chips, marshmallows, fruit cocktail and rice cakes. They were given a meal of one of the foods halfway through and encouraged to eat until they were full. Afterward, when they were shown images of foods that they said they didn’t want, the areas of the brain associated with rewards continued to respond.
“It doesn’t matter how sick you are of the food, the brain responds with a reward signal when you see a cue,” Sambrook said. The brain is “highly sensitive to food images,” Jessica Higgins, a registered dietitian in the Lifestyle Medicine Program at NYC Health + Hospitals/Woodhull, told HuffPost. She said the latest study adds to other research showing that what causes you to snack “often has little to do with true hunger,” and may include “where we are, who we’re with, our emotions, what types of foods are available around us, and food advertisements.”
Does this mean snacking is beyond your control?
The desire or urge to snack may be “quick and automatic, so it may seem like you’re out of control, but control still exists,” Theresa Gentile, a spokesperson for the Academy of Nutrition and Dietetics, told HuffPost. “I spend a lot of time helping my clients build new habits so eating well feels easier and doesn’t rely on willpower alone,” she said. This often involves reshaping their environments to avoid cues that trigger the urge to snack — for instance, by avoiding a work breakroom full of junk food, Gentile explained. You may not have control over how your brain responds to seeing food, but you can control whether you eat it, Higgins said. Recognize what entices you to snack (such as food ads, stress or social pressure), focus on what you can control (the foods you buy), the meals you eat during the day, and your body’s hunger and fullness cues.
The benefits and drawbacks of snacking
Snacking isn’t always a negative thing. Gentile said it can be an opportunity to fill nutrition gaps when it’s not possible to meet your nutritional requirements in three meals a day. “Snacks, especially if healthful, also fuel us during long periods of time in between meals,” she said. The downside is that people often turn to junk food, which lacks nutrition and typically contains excess sugar and fat, Gentile said. These foods tend to be “hyperpalatable,” meaning they’re hard to stop eating, and pack in extra calories in small portions, Higgins added. People also tend to snack out of boredom, which can reinforce unhealthy habits and lead to overeating, Gentile said. Snacking also isn’t a good idea if it causes you to skip nutritious meals, Higgins added.
What to do when you struggle with snacking self-control
When you respond to a food cue, you’re creating an association that becomes a habit, Sambrook said, adding, “But every time you don’t engage in habitual behavior, you weaken that association and de-automatize it.” So, breaking a snacking habit starts with avoiding the cues, he said. But that can be easier said than done. Here are some tips to avoid over-snacking:
- Eat enough throughout the day. Over-restriction or skipping meals can encourage snacking, Higgins said. Eating balanced meals that include a mix of protein, whole grains, fruits, vegetables and healthy fats will help you manage hunger, cravings, energy and mood.
- Put friction between you and the snack. For instance, Gentile said to avoid activities associated with snacking, like mindless phone scrolling or TV watching. Make it more difficult to access unhealthy foods, such as by deleting food delivery apps or keeping these items out of your pantry.
- Change your environment. Gentile said to go for a walk after lunch if you usually grab something sweet: “This clears your mind and gives your brain time to get the ‘I’m full’ signal.”
- Pay attention to how you feel while snacking. If you snack when you’re not truly hungry, Higgins said to consider whether you’re stressed, distracted or bored. This often triggers mindless snacking.
- Ultimately, get to know your hunger and fullness signals, Gentile added.
How to embrace healthy snacking
All foods can fit into a healthy eating pattern, including snacks, Higgins said. If you need help scheduling snacks, exploring your relationship with food, or identifying the best foods to meet your needs, she suggested seeking advice from a registered dietitian. “Healthy snacking is about balance, timing, and choosing nutritious foods,” she said. It can help you increase your intake of fruits, vegetables, healthy proteins and fats, and whole grains. For example, some healthy snacks include fruit and nuts, popcorn, roasted chickpeas or edamame, veggies with hummus or guacamole, or whole wheat toast with peanut butter. Overall, keep healthier foods visible and easy to grab, and less nutritious options out of sight, Gentile said. “At the end of the day, your environment matters,” Gentile added. “If you come home starving and a bag of chips is sitting right in front of you, chances are you’ll reach for it.”
