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The Neuroscience of Food Noise: How GLP-1 Drugs Change Appetite and Reward · Understanding the Brain

• 0:01
  Speaker 1: Do GLP-1s affect your brain and the relationship with food?
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  Speaker 1: So if you spend most of your day thinking about food,
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  Speaker 1: you finish breakfast, but you're already thinking about lunch, you
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  Speaker 1: walk past a bakery and suddenly you want something sweet,
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  Speaker 1: even after eating a big dinner. Now think about taking
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  Speaker 1: a medication and discovering that those thoughts have disappeared. For
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  Speaker 1: some people using GLP-1 medications, such as samaglutide, sold as
• 0:26
  Speaker 1: mozembic or wegovi, or manjaro or zepan, this change can
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  Speaker 1: be remarkable. They describe something researchers and patients increasingly call
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  Speaker 1: food noise, persistent thoughts about eating that seem to operate
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  Speaker 1: independently of physical hunger. But what is exactly happening in
• 0:42
  Speaker 1: the brain? GLP-1 stands for glucagon-like peptide 1. We've talked
• 0:45
  Speaker 1: about that. It's a hormone released by the intestines following
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  Speaker 1: food consumption. It also helps regulate blood glucose, stimulates insulin
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  Speaker 1: secretion when glucose is elevated, and contributes to feelings of
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  Speaker 1: satiety or feeling full. However, GLP also participates in communication
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  Speaker 1: between the digestive system and the central nervous system. The
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  Speaker 1: brain contains GLP-1 receptors in regions involved in appetite regulation,
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  Speaker 1: including the hypothalamus and brain stem. These structures help determine
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  Speaker 1: when you're hungry. Medications that activate these receptors can alter
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  Speaker 1: those signals. Consider the hypothalamus, which integrates information about energy
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  Speaker 1: availability and nutritional status. GLP-1 receptor activation can influence... neural
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  Speaker 1: pathways that promote satiety, making it easier to stop eating
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  Speaker 1: after consuming small portions. But hunger is only part of
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  Speaker 1: the story. Eating also involves reward. The mesolimbic dopamine system,
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  Speaker 1: including connections involving the VTA, the ventral tegmental area, and
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  Speaker 1: nucleus accumbens, contributes to motivation and the anticipation of pleasurable experiences.
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  Speaker 1: Research in animals suggests that GLP-1 receptor activation can influence
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  Speaker 1: these reward pathways, potentially reducing motivation to pursue highly palatable foods.
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  Speaker 1: Human neuroimaging studies have also reported changes in brain responses
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  Speaker 1: to food cues during GLP-1 treatment, although findings vary across medications,
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  Speaker 1: brain regions, and experimental conditions. A person may still enjoy
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  Speaker 1: chocolate cake, but no longer experience the same persistent urge
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  Speaker 1: to seek it out. The pleasures associated with eating and
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  Speaker 1: the motivation to obtain food are related, but they're not
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  Speaker 1: the same. That may explain why some patients report that
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  Speaker 1: food becomes less demanding psychologically. Researchers are also investigating whether
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  Speaker 1: these medications influence other reward-related behaviors like alcohol consumption and
• 2:32
  Speaker 1: substance use, and we'll have future episodes talking about that.
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  Speaker 1: Not everyone experiences a dramatic reduction in food-related thoughts, however.
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  Speaker 1: Some individuals experience nausea, fatigue, or reduced enjoyment of eating.
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  Speaker 1: Researchers are still determining how much the reported reduction in
• 2:48
  Speaker 1: food noise reflects changes in reward processing, decreased physical hunger,
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  Speaker 1: or both.