It happens to everyone. You skip lunch, the appointment gets longer, the afternoon becomes endless and, without realizing it, you find yourself more nervous than usual. A word out of place is annoying, a small difficulty seems enormous. Usually the explanation is immediate: “I’m hungry, my sugar levels are low.”
New research, published in the scientific journal EBioMedicinetells a different story. And it does this by observing people in real life, not in the laboratory. The conclusion is as simple as it is surprising: it is not the drop in glucose that worsens the mood, but the moment in which hunger becomes a sensation of which we are aware.
In other words, the body may be low on energy, but if the mind doesn’t register hunger, the mood remains stable. The study followed ordinary people, engaged in their daily lives, for four weeks. Each wore a sensor to constantly monitor their blood glucose. Several times a day, via an app, they were asked to indicate how hungry, full they felt and what kind of mood they were experiencing at that moment.
No imposed diet, no fixed timetable. Just normal days, with irregular meals, work, unexpected events, tiredness. It is precisely here that the most interesting data emerges: glucose levels could drop significantly without the mood changing in the slightest. The nervousness only appeared when people started saying, “I’m hungry.”
Hunger as an experience, not as a given
Dr. Kristin Kaduk, from the University of Tübingen, explains it clearly: when glucose drops, the mood worsens only because the feeling of hunger increases. It is not the biological value itself that influences us, but how that lack of energy is perceived and interpreted.
The number alone is not enough. You need the sensation. This completely changes the way we look at hunger-related irritability. It is not an automatic process, nor a purely chemical reaction. It’s something that comes from awareness. When hunger remains in the background, the mood holds. When it becomes apparent, the mind comes into play. That’s where the physical signal transforms into emotion.
The researchers saw it clearly: by including perceived hunger in the analysis models, the direct link between glucose and mood practically disappears. It is hunger that drives emotional change, not blood value.
Those who listen to their body react better
Then there is another interesting aspect. The study took into consideration the so-called interoception, that is, the ability to feel and recognize the body’s internal signals: hunger, thirst, tension, calm.
Not everyone has it the same way. Some people notice the first signs immediately, others only notice them when they become strong. Well, those who have greater body awareness tend to experience fewer mood swings, even on days when glucose varies a lot.
According to Professor Nils Kroemer, this ability works as a kind of emotional shock absorber. Feeling the body, understanding it before it “screams”, helps to remain more stable, even when energy drops.
It’s a subtle but important step: it’s not about controlling the body, but about realizing it. Many previous studies had tried to understand the relationship between hunger and mood under controlled conditions, with standard meals and specific tests. The results were often contradictory. Some spoke of a strong bond, others of no effect. Observing daily life clarified why. Our days are not regular. We sleep little, eat late, move unpredictably. Yet, amidst all this, one thing remains constant: when we feel hungry, our mood changes.
The data is repeated in people with different lifestyles, different weights, different habits. It doesn’t matter who you are or how you live. It matters if that hunger reaches consciousness. This discovery also opens up interesting reflections on the mental health front. Mood disorders and metabolic problems often coexist. Better understanding the role of body awareness could help address both.
Researchers hypothesize that training the ability to recognize internal signals, or working on communication pathways such as the vagus nerve, can promote greater emotional stability. It’s not about intervening on glucose, but about preventing hunger from taking you by surprise. Realizing you’re hungry beforehand, instead of getting there when the irritation has already exploded, can make a real difference.
The final message is simple. It’s not the body that betrays us when we’re hungry, but how we interpret its signals. Hunger becomes an emotion the moment we recognize it as such. Listening to the body, without ignoring it and without dramatizing it, can help us live more balanced days. Even emotionally.
You might also be interested in:
