Peering Into the Brain to Understand Food Noise at the Source
An important new study in Nature Medicine yesterday gave us a unique view of food noise at a source deep within the brain. Researchers implanted electrodes in the nucleus accumbens of a single subject to monitor brain activity in that region of the brain. The subject had a history of severe obesity and distressing preoccupation with food – something commonly labeled as food noise.
Researchers observed the modulation of activity in this region of the brain over time while the patient received varying doses of tirzepatide. They found brain activity that correlated with variations in the experience of food noise. They concluded that the effects of tirzepatide on food noise might be explained by the modulation of activity in this region of the brain.
A Fascinating Case Study
Researchers focused their monitoring reports on moments when the participant reported intense “food preoccupation.” They found increased brain activity in the delta–theta frequency band (≤ 7 Hz) in the nucleus accumbens during the moments of this intensity. Over time, while the person was on tirzepatide, they documented a period (months 2-4) of few preoccupation episodes. Later, they found evidence of a “breakthrough” period in months 5-7. The delta-theta signal re-emerged and preoccupation episodes increased even though the drug dose was maximized.
This suggests that the delta–theta band oscillation might serve as a biomarker of food-preoccupation vulnerability. The authors propose that tirzepatide may modulate reward-system activity, but that the biomarker’s reappearance might signal waning effect or adaptation.
A Clue, Not the Answer
Clinical reports of the effect that tirzepatide and semaglutide can have on the experience of food noise have been striking. This new report offers a tantalizing clue about the neurophysiology of this phenomenon. But needless to say, caution is necessary. This is an observation from a single-case study. it offers an important clue, but only a clue.
We have much to learn about food noise.
Click here for this new paper in Nature Medicine, here, here, and here for further perspective.
Nucleus Accumbens, magnetic resonance image by Geoff B. Hall / Wikimedia Commons
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November 18, 2025
