Can Lack of Sleep Cause Sugar Cravings?
CravingsProbably, yes, at least in the short term. In a UC Berkeley study, people who were sleep deprived found high-calorie foods more desirable, and their brain scans showed less activity in the area that helps with decisions. It was a small study, but it matches what many of us feel after a bad night: we want something sweet, and we want it now.
What the study found
Researchers at the University of California, Berkeley scanned the brains of 23 healthy young adults twice, once after a normal night’s sleep and once after a sleepless night. The results were published in Nature Communications. After the sleepless night, high-calorie foods became significantly more desirable to the participants. Their scans showed reduced activity in the frontal lobe, which governs complex decisions, and heightened activity in deeper, reward-related regions. The participants also leaned toward unhealthy snacks and junk food.
What it doesn’t tell us
It’s honest to say what this study can’t prove. It was small, it involved young healthy adults, and it used a full night without sleep, which is more extreme than a few short nights. So we wouldn’t say that one rough night will wreck your eating. We’d say it fits a pattern many people notice: when we’re running on empty, our willpower is, too.
What you can do on tired days
- Expect it. Knowing that tired days come with louder cravings makes them less of a surprise.
- Start the day with a real breakfast. Something with protein and fiber gives you a steadier start.
- Keep a go-to snack nearby. Fruit with nuts, yogurt, or whatever feels good to you, so you aren’t deciding from scratch at 3 p.m.
- Have the sweet thing on purpose. If you want it, pick a portion, sit down and enjoy it.
- Go easy on yourself. A craving on a tired day is information, not a verdict.
Try this today
On your next tired day, write one line in your notes: tired today, cravings louder. After a couple of weeks, you may see the pattern clearly.
FAQs
Can one bad night of sleep make me crave sugar?
In the Berkeley study, a full sleepless night made high-calorie foods more appealing. A single short night is less clear, but many people notice it anyway.
Will sleeping better stop my cravings?
We can’t promise that. Sleep is one piece of the puzzle, alongside stress, meals and habits.
What if I’m always tired?
It’s worth talking to a doctor. Ongoing tiredness has many possible causes and deserves proper attention.
Sleepy and craving something sweet? Come share your tired-day survival tips in the Sugar Control Circle on Facebook.
This article is for general wellness and isn’t medical advice.
Sources: University of California, Berkeley: Poor sleep and junk food
