Always craving snacks? Scientists say it’s not willpower controlling your appetite, but 3 brain traps
So we’ve finally found the real reason behind constant cravings
During an afternoon meeting at the office, a coworker quietly pulls out a box of cookies. Some people immediately take two, while others don’t even glance at them. You, meanwhile, may debate with yourself for ages, only to give in and eat one anyway. You may have just finished a big bowl of rice, then catch the smell of a bakery as you walk by and feel like you could still fit in a croissant. Why do we respond to food so differently? It isn’t simply a question of willpower. A recent report from the University of Cambridge suggests that the food choices we make each day involve a highly complex network of neural processes in the brain. So what is controlling our appetite, and how can we respond more wisely?
- Related reading: Don’t assume only desserts affect your blood sugar: these everyday foods are the real culprits to avoid!
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What’s the difference between hunger and appetite?
To understand how the brain works, we first need to distinguish between physical hunger and psychological appetite. Giles Yeo, a professor of molecular neuroendocrinology at the University of Cambridge, explains that hunger is a direct physiological response. When your body lacks energy, the hypothalamus at the base of the brain detects a drop in blood sugar and uses the hormones leptin and ghrelin to signal that it’s time to eat.
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Appetite, on the other hand, is much more complex. It encompasses the internal and external reasons we eat, including satiety and the reward system. Scientists have identified more than 1,000 genes that can influence appetite. That’s why some people naturally see food simply as fuel and eat only when it’s time to eat, while others are thoroughgoing food lovers, always thinking about their next meal.
Why do we still want dessert even when we’re full?
Have you ever finished a big brunch with your stomach already completely full, then spotted French pastries in a display case and felt as if you had a separate stomach for them? That’s entirely your brain’s reward system at work; it has nothing to do with how much room is left in your stomach.
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When food stretches the walls of our stomach, the vagus nerve sends a signal to the hindbrain that we’re full. Higher brain networks, however, are driven by dopamine and constantly seek out activities that bring pleasure and stimulation. So even when you’re physically 100% full, an enticing slice of chocolate cake can still instantly activate the reward system. Neuroscientists call this “hedonic hunger.” As soon as your sight, smell, or even hearing picks up appealing food cues, the brain releases dopamine in a frenzy, urging you to eat.
Why do we keep wanting to eat when we’re stressed?
If work has been especially stressful lately or you’ve stayed up late for several nights in a row, you may find your cravings becoming hard to control. Nutritional neuroscientist Timothy Frie explains that under intense stress or extreme fatigue, the prefrontal cortex’s ability to regulate rational thought and decision-making declines sharply, while the appetite and reward systems become unusually active.
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At times like these, the brain instinctively seeks quick, efficient sources of energy. Processed foods often combine high levels of sugar, salt, and fat, rapidly raising blood sugar while offering an irresistible crunch and aroma. Relying on these foods during prolonged periods of stress gradually reduces the body’s sensitivity to insulin and leptin, creating a vicious cycle that makes it increasingly difficult to tell whether you’re truly full.
4 everyday practices to move away from emotional eating
Our bodies function much as they did in the hunter-gatherer era thousands of years ago, and the brain still favors storing calories. Modern life, however, offers far too many food choices. From delivery apps to convenience stores, we’re bombarded with food cues every day. If you rely only on willpower or extreme dieting, it’s hard to maintain your weight in the long run. Experts suggest starting with the following everyday habits:
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1. Practice a one-second pause
The next time you want to reach for a snack, pause for a moment and take a deep breath. Ask yourself: “Do I want to eat right now because I’m truly hungry, stressed, in the habit of snacking, or simply because I saw food?” This simple step can reactivate the brain’s rational areas, turning unconscious eating into a conscious choice.
2. Remove visual temptations
Since seeing food triggers dopamine release, the most effective physical defense is to put it away. Clear the snacks from your desk and unfollow food-focused Instagram accounts that always leave you craving something late at night.
3. Find other ways to relieve stress
When you’re stressed, your brain simply needs dopamine. Rather than buying a high-calorie bubble tea, take a 10-minute walk, listen to a song you like, or chat with a close friend. Each can offer a healthier sense of reward.
4. Choose whole foods
Choose whole foods rich in protein and healthy fats whenever possible. They provide steady energy and keep your brain from feeling as though it’s constantly facing famine.
Once you understand how your body works, don’t be too hard on yourself the next time you accidentally eat an extra cookie. As you gradually learn to recognize the real signals your body is sending, you can regain control over your relationship with food.
Beyond this article, the following recent reports are also worth your attention:
- Painless summer weight loss: Follow Hong Jin-kyung and Ryu Hye-young with these 3 go-to menus
- Your Weight-Loss Enemy Might Actually Be the Weather: That Sudden Spike in Appetite Could Be Seasonal Depression at Work
- Stop blaming yourself for eating too much: this 30‑second cracker test reveals if you’re actually “easy to gain weight” — even Namkoong Min’s genes say yes
