The Fluoride-IQ Study, Read Properly [Journal Club]

The Fluoride-IQ Study, Read Properly [Journal Club]

In January 2025, a New York Times headline announced that fluoride exposure is linked to lower IQ in children. Within days, parents were tossing fluoride toothpaste and buying water filters, and a national political fight reignited over community water fluoridation. The paper behind the headline — Taylor et al, JAMA Pediatrics — is the largest and most rigorous meta-analysis of fluoride and children’s IQ ever assembled. It includes 74 studies and roughly 21,000 children. So it deserves a careful read, not a panicked one. And that’s what this episode is. Dr Cois, an Emergency Physician, breaks the paper down Journal Club style. He walks through the PICO framework — Population, Intervention, Comparator, Outcome — then steps through the three separate analyses inside the paper and explains why they don’t all point in the same direction. You’ll learn where the IQ signal is genuinely concerning (at high exposures), where it gets shaky (at the WHO threshold), and where it essentially disappears (at the levels an American kid actually drinks). You’ll also learn to spot cherry-picking — the influence tactic that takes a true finding, strips away its context, and turns it into a panic headline. And you’ll meet the more US relevant evidence the headlines ignored: the Australian Do et al cohort. Whether you’re a clinician fielding the “should I stop using fluoride?” question, a trainee learning to appraise a meta analysis, or a parent who just wants the truth — this one’s for you. Key takeaways •  The pooled IQ signal is driven largely by high-exposure, high risk-of-bias studies, and is largely absent below 1.5 mg/L in drinking water •  The best-quality data shows roughly one IQ point per 1 mg/L of urinary fluoride — negligible for an individual, debated at population scale •  The authors state plainly that this paper was not designed to address US water fluoridation •  Screen the patients who genuinely face high exposure — private wells, high-fluoride regions, pregnancy, and infancy — and leave the toothpaste alone Disclaimer This episode is for educational purposes only. It does not provide medical advice and does not establish a physician patient relationship. Always discuss management decisions with a qualified clinician. Full references are at DrCois.com.

Quick Hits: How an ED Doctor Reads a Medical Paper

Quick Hits Episode 6. A listener wrote in asking for a framework to read a medical paper — and it could not be timelier. Misinformation has now been ranked the most severe short-term risk facing the world by the World Economic Forum, ahead of armed conflict and cyber attacks. One in four Gen Z respondents turns to TikTok for medical advice, and viral medical content is consistently more likely to be wrong than non-viral content. In this episode, Dr Cois walks through the three-question framework that every medical student is taught — and that he still uses today on every paper he reads. Then he pressure-tests it by walking you through three different studies that have tried to answer the same question: does saturated fat raise your cardiovascular risk? A human-and-overfeeding mechanism study, an umbrella review of cohort data, and a Cochrane meta-analysis of randomised controlled trials — same question, three different weights of evidence, one converging answer. If you have ever wanted to push back on the loudest voice in the room without needing a medical degree, this is your playbook. Key Takeaways •  Misinformation is the #1 short-term global risk; thefirehose is not slowing down •  Three-question framework: study type and journal,funding and authors, PICO •  PICO unpacks to Population, Intervention, Comparator,and Outcome •  The body of evidence is what matters — convergenceacross study designs is the signal •  Five red flags: single studies, surrogate outcomes, relative risk without absolute risk, cherry-picking, and conclusions that don’t match the data •  Your homework: track one social-media health claim back to the paper and run the PICO Disclaimer This podcast is for educational purposes only and does not provide medical advice or establish a physician patient relationship. Always consult a qualified clinician for personal health questions.

Quick Hits | Why the Same Drug Can Cost $90 or $9 at the Same Pharmacy — A Doctor Explains

My pharmacy tried to charge me $90 for a generic nausea medication. Five minutes later, with a coupon I signed up for in the aisle, I paid $9. Same drug. Same store. Same five minutes. If that sounds impossible — or like a trick — this episode is for you. In Quick Hits Episode 5, I walk you through exactly how prescription drug pricing works in America, who is actually setting the price you pay (hint: not your insurance company, not the pharmacy), and the three-step habit you can use every single time you fill a script. This is one of those moments where a small amount of knowledge gives you real power. •  There is no single “real” price for your medication. Multiple negotiated prices exist, and which one you pay depends entirely on which contract you invoke at the counter. •  Pharmacy Benefit Managers (PBMs) — not your insurance company — do most of the actual price-setting. Three companies control 79% of all U.S. prescription drug claims. •  The “cash price” is almost never the real price. It’s a sticker price designed for patients who don’t know to ask for anything else • GoodRx isn’t cash. It’s a different PBM’s contract you can piggyback on. • Three habits, every prescription: Ask the cash price. Compare on GoodRx and Cost Plus Drugs. Choose the lowest legitimate option. •  The February 2026 PBM reforms are a real step forward — but none of it changes what you pay today. Disclaimer This podcast is for educational purposes only and is not a substitute for medical advice, diagnosis, or treatment. Always consult your physician or pharmacist regarding your specific situation.

Overhead Journal Club - SALT-ED Trial

Welcome to Overheard Journal Club. In this new short-form series, ED physician Dr Adrian Cois takes a single paper that's changed how he practises and breaks it down conversationally — PICO, results, critical appraisal, and the practical "so what do I do with this on my next shift" synthesis. First up: SALT-ED. Self and colleagues, NEJM 2018. A pragmatic crossover trial in 13,347 noncritically ill adults asking whether balanced crystalloids beat normal saline as the default IV fluid in the emergency department. The answer reshaped Adrian's reflex — and gave him his favourite pharmacology joke. In this episode: why "normal" saline carries a supraphysiologic chloride load, how the pragmatic crossover design hit 88% adherence without blinding, what the MAKE30 composite outcome actually means, and the short list of hard indications for which saline still earns its place on the IV pole. Key takeaways •  In noncritically ill adults receiving IV fluids in theED, balanced crystalloids reduce major adverse kidney events at 30 dayscompared with saline (NNT 111). •  The mechanism is the supraphysiologic chloride load insaline, which causes hyperchloremic metabolic acidosis. •  Default to lactated Ringer's. Reserve saline for hyperkalemia, traumatic brain injury, hyponatremia, and drug compatibility issues — and even then, keep volumes modest. Disclaimer Educational content only. Not medical advice. Does not establish a physician-patient relationship. Always discuss management decisions with a qualified clinician.

Quick Hit: The VO2 Max Myth Social Media Won’t Tell You About

Two vehicles. Same destination. One question: which one will you actually do? If you’ve spent any time on health and fitness social media in the last two years, you’d be forgiven for thinking the only acceptable way to train your VO2 max is to strap on a weighted vest and grind out an hour of Zone 2 cardio every day. That’s what the algorithm is selling. The data tells a very different — and far more forgiving — story. In this Quick Hit, Dr Cois walks through the two evidence backed vehicles for building cardiorespiratory fitness in the average adult: Zone 2 cardio and interval training. Both work. Each has a place. And the choice between them is far more practical than philosophical. You’ll get the conversation test for finding your Zone 2 without a heart rate monitor, a 4-week interval progression that reliably moves the VO2 max needle by 5–10 points, the under prescribed half of the exercise guideline almost nobody is doing, and the simplest predictor of whether you’ll still be exercising a year from now. Plus: a heads-up on what’s coming next — Overheard Journal Club. Key Takeaways •  VO2 max is one of the strongest predictors of long-term health we have • Roughly half of US adults don’t meet even the aerobic activity guideline • Zone 2 is a way, not the way — and it has one underrated strength • Intervals are extraordinarily time-efficient and free up space for strength training • Adherence beats optimisation — the vehicle you’ll actually do is the one that wins Disclaimer Educational content only. Not medical advice. If you are starting a new exercise program, have known cardiovascular disease, or have symptoms with exertion, consult a qualified clinician before beginning.