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Mind Over Matter: Can Negative Thoughts Make You Sick?
8 May
Summary
- The nocebo effect links negative expectations to physical illness.
- MPI can spread rapidly globally via social media platforms.
- Beliefs about genes can alter hormone levels and physical traits.
The nocebo effect, rooted in the Latin phrase for "I will harm," describes how negative expectations can lead to illness. Science writer Helen Pilcher's book, "This Book May Cause Side Effects," delves into this phenomenon, explaining that warnings of symptoms can increase their likelihood. Studies of clinical trials indicate that side effects are frequently reported, even when participants receive a placebo.
Beyond drug reactions, the nocebo effect is linked to various conditions, including mass psychogenic illness (MPI), where collective fear can trigger widespread symptoms. Historically documented, MPI's contagion rate has accelerated with modern global communication and social media. An instance in Colombia in 2014 saw an HPV vaccine scare spread MPI among schoolgirls, significantly dropping vaccination rates.
Research also indicates that beliefs can cause measurable physical changes. A Stanford study showed that telling participants they had genes associated with obesity or leanness altered their GLP-1 hormone levels differently. Investigations into mouse brains suggest that stimulating areas linked to positive emotion can curb cancer growth, while dampening them accelerates it, hinting at a profound connection between mental states and physical health.
