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The Power of Negative ExpectationIn her latest book, Helen Pilcher investigates the profound connection between the mind and the body, specifically focusing on the phenomenon where negative beliefs can cause physical illness. Drawing on Roald Dahl’s The Twits, Pilcher illustrates the age-old intuition that ugly attitudes deform the face. However, her work moves beyond fiction to explore the scientific reality of the nocebo effect—a Latin term meaning "I will harm"—which occurs when a person's negative expectations lead to symptoms.Deconstructing the Nocebo EffectThe nocebo effect operates on a simple yet powerful psychological principle: the more you are warned to expect a symptom, the more likely you are to experience it. This is often described as the psychological equivalent of the "pink elephant" paradox; if you are told not to think of a pink elephant, you inevitably do. Pilcher analyzes 231 placebo-controlled clinical trials, finding that 76% of people in experimental groups reported side-effects, compared to 73% of those on a placebo. This suggests that most of us experience bodily sensations, but the nocebo effect causes us to misattribute these harmless feelings to medication.Measurable Biological ShiftsPilcher argues that the impact of the nocebo effect is not merely subjective but measurable. She highlights a striking study from Stanford where participants were told they possessed a gene associated with either high or low obesity risk, regardless of their actual genetics. The results showed that those told they had the "skinny" gene experienced a significant increase in GLP-1 (a hormone that induces satiety) after a meal, while those told they had the "fat" gene showed no change. Furthermore, Pilcher discusses research where stimulating a specific area of a mouse's brain associated with positive emotion was found to curb cancer growth, while dampening it accelerated it. This challenges the boundary between mental processes and physical disease.From Mass Panic to Medical PracticeThe book delves into the history of mass psychogenic illness (MPI), where collective anxiety spreads symptoms through a population. Historically limited by geography, MPI today can go viral due to global communication and social media. A prime example cited is the 2014 outbreak in Colombia, where social media was thought to transmit symptoms among schoolgirls who had received the HPV vaccine. Despite health officials finding no link, public confidence collapsed, dropping immunization rates from over 90% to 5%. This case underscores the vulnerability of public health to the nocebo effect at scale.The Future of Mind-Body MedicinePilcher’s work raises central philosophical questions about the nature of mind and matter. While she cautions against drawing direct parallels between mouse brain stimulation and human thought, the evidence suggests that our internal narratives can significantly alter our biology. Ultimately, understanding the nocebo effect offers a path to mitigate its negative impacts, potentially allowing individuals to avoid self-fulfilling prophecies of illness. As Pilcher notes, avoiding the nocebo effect is a "pretty good one" side-effect to have.

Scientists have made a groundbreaking discovery that could lead to the development of new obesity drugs. By studying the unique metabolic abilities of pythons, researchers have identified a molecule that appears to play a crucial role in regulating appetite and weight loss. The molecule, called pTOS, was found to increase significantly in the blood of pythons after they eat, and when administered to obese mice, it led to a significant reduction in food intake and a 9% loss of body weight over 28 days. The discovery could lead to the development of new obesity drugs that work in a different way to existing medications, such as GLP-1 medications like Wegovy. Unlike these medications, which can have side effects such as nausea and stomach pain, pTOS appears to act on the brain's appetite centers, reducing food intake without these adverse effects. The researchers, led by Dr. Jonathan Long from Stanford University and Prof. Leslie Leinwand from the University of Colorado Boulder, published their findings in the journal Nature Metabolism. They believe that pTOS, which is naturally produced by the snake's gut bacteria and also found in human urine, could be a safe and effective treatment for obesity. While further research is needed before the findings can be applied clinically, the discovery is seen as a promising step towards the development of new obesity treatments. The study's results suggest that pTOS could be a potential therapeutic target for the treatment of obesity and related metabolic disorders.