Placebo Pills, Cannabis, Wall Squats for Blood Pressure, Birdwatching, and the Porn brain : 1564

Placebos Improved IBS Symptoms Even When Patients Knew the Pills Were Inactive In a randomized trial of 80 adults with irritable bowel syndrome, participants who knowingly took placebo pills reported greater symptom improvement than those receiving no treatment. After three weeks, 59% of the placebo group reported adequate relief compared with 35% of controls. A larger follow-up study also found that openly prescribed placebos improved reported IBS symptoms more than a no-pill control. Host Dave Asprey explores how conditioning, expectations, and the ritual of taking a treatment may influence symptoms without deception. He explains why these findings do not mean symptoms are imaginary or that positive thinking can cure disease, but raise questions about how the brain, treatment context, and learned physiological responses shape the experience of illness. Sources: PLOS ONE: Placebos Without Deception—A Randomized Controlled Trial in Irritable Bowel Syndrome Pain: Open-Label Placebo vs. Double-Blind Placebo for Irritable Bowel Syndrome Harvard Health: A Placebo Can Work Even When You Know It’s a Placebo

Once-Weekly Wall Squats Preserved Some Blood-Pressure Benefits After More Frequent Training A randomized trial involving 100 adults found that isometric wall-squat training reduced blood pressure, with some benefits maintained after participants cut back to one or two sessions per week. The important detail is that participants first completed four weeks of training three times weekly. Those who subsequently reduced to one weekly session finished the eight-week study with systolic blood pressure approximately 6.6 mmHg below baseline, while those continuing three weekly sessions experienced the largest improvement. Host Dave Asprey explores how sustained muscle contractions may influence vascular resistance and autonomic regulation, and why the minimum dose needed to maintain a benefit can differ from the dose needed to build it. He explains why this study does not show that beginners get the same results from one weekly session or that wall squats replace medication. Sources: BMJ Open Sport & Exercise Medicine: Isometric Exercise Training and Blood Pressure Control Full Study: Exploring the Dose-Response to Training Frequency

Expert Birdwatchers Showed Brain Differences Linked to Attention and Perception A study comparing 29 expert birdwatchers with 29 beginners found differences in brain structure and activity associated with bird-identification expertise. Experts showed lower mean diffusivity in regions involved in attention and perception, an MRI finding researchers interpreted as more compact tissue organization. Some differences were also present in older experts, raising questions about how sustained learning may relate to cognitive aging. Host Dave Asprey examines why birdwatching involves more than spending time outdoors: identifying unfamiliar species requires attention, visual discrimination, memory, and continued learning. He explains why these findings are interesting without proving that birdwatching prevents dementia or slows cognitive decline, since researchers cannot determine whether the hobby caused the differences or whether preexisting characteristics helped people become experts. Sources: The Journal of Neuroscience: The Tuned Cortex—Expertise-Related Structural and Functional Remodeling Across the Adult Lifespan Society for Neuroscience: Skills From Being a Birder May Change—and Benefit—Your Brain BBC Future: Birdwatching Rewires the Brain and Slows Cognitive Decline

Early THC Exposure Changed Serotonin Signaling in Mice Through an mTOR-Related Pathway A mouse study found that chronic THC exposure beginning early in life altered signaling through serotonin 5-HT2A receptors and increased sensitivity to a subsequently administered serotonergic drug. THC alone did not significantly disrupt the study’s baseline sensorimotor-gating measure, but previously exposed mice showed a greater disruption after the addi