Broadcast from KSQD, Santa Cruz on 8-27-2026:

• Preparing for extreme heat requires a few days of controlled hyperthermia to boost blood plasma volume and trigger heat shock protein production. Dr. Dawn cites research showing that daily 40-minute treadmill sessions in an 80-degree room followed by 40-minute hot baths for six days—or simply an hour daily in a 40°C bath for four days—produces 75-80% of full acclimatization before a heat-zone trip.
• Five red flags warrant an ER trip for abdominal pain: pain worsening with coughing or car bumps (peritonitis), lack of gas passage with nausea (bowel obstruction) especially with dark green bilious vomiting, yellowing whites of eyes (bile duct obstruction with sepsis risk), tarry black shiny stool (bleeding ulcer versus coffee-ground vomit), and dizziness with pain (possible leaking aortic aneurysm). Dr. Dawn urges any man who has smoked over 100 lifetime cigarettes to request the Medicare-covered abdominal ultrasound screening for aortic aneurysm, noting only 4% of eligible men currently receive it.
• Quaternary ammonium compounds (QACs) fill nearly half of disinfectants, surface sanitizers, and cleaning wipes, with use surging after 2016 FDA antimicrobial bans and the COVID pandemic. A 2023 Environmental Science and Technology review documented reproductive toxicity, hormone mimicking, dermal and respiratory irritation, and disruption of mitochondrial oxidative phosphorylation. Dr. Dawn recommends apple cider vinegar and water as a safe household cleaner and directs listeners to EWG.org for QAC-free product listings.
• A UK Biobank study of 65,000 people born in the 1940s-50s exploited WWII sugar rationing (eight ounces weekly through 1953) as a natural experiment. Those exposed to less sugar before age two had 20% lower dementia risk with 2.5-year delayed onset, and protection held even for those whose low-sugar exposure was purely in utero—underscoring the importance of avoiding added sugars in baby foods during the first 1,000 days.
• A Coast Guard rescuer's suicide following years of headaches and mood swings prompted his teenage daughter's high school survey of 77 surfmen, most of whom described the same TBI symptoms. Repeated boat impacts hitting waves at 6G at the deck translate to roughly 60G at the sailor's head—more violent than car crashes—prompting the Coast Guard's first official acknowledgment of the wave-pounding brain injury problem.
• Anopheles stephensi, a hardy South Asian malaria vector that thrives in urban environments and survives dry seasons, has spread from Djibouti (2012) through Yemen, Ethiopia, Sudan, and Kenya. Genomic analysis reveals distinct genetic clusters as it advances, all largely resistant to standard mosquito-control chemicals used in netting and sprays. Dr. Dawn ties this to broader arthropod-borne disease expansion in the U.S. from climate warming, and defends deer culling as tick-vector reduction.
• Dr. Dawn recommends the PREVENT calculator (using blood pressure, cholesterol, age, sex) as the starting point for coronary risk assessment. Coronary calcium scores are most useful for those in the borderline/intermediate range (3-9% ten-year risk)—a score above age-normal warrants reconsidering statin therapy—but add little value at high risk (where zero calcium doesn't rule out non-calcified plaque) or in older patients.
• An update on shingles vaccination and dementia: Geldsinger's 2025 Welsh natural-experiment study (exploiting birthday-based Shingrix rollout cutoffs) showed a 20% dementia reduction, since replicated in Canada, Australia, and Scotland. New Hebrew University data suggests giving Shingrix four weeks apart (Dr. Dawn cautions against this shortened interval) may stabilize cognition in existing Alzheimer's patients. The proposed mechanism involves boosting regulatory T-cells that dampen chronic neuroinflammation—also explaining why BCG (400% dementia reduction in bladder cancer patients) and flu vaccines show similar protective effects.
• An oral KRAS-inhibiting drug, daraxonrasib, doubled median survival in 500 patients with metastatic pancreatic cancer from about six months to 13.2 months by blocking proteins produced by the historically undruggable KRAS gene—the first major advance for a cancer where metastatic diagnosis has meant near-immediate death sentence.