The 8 Glasses of Water Rule Is a Myth. Here's the Real Answer

5 Over-the-Counter Pills That Are Quietly Damaging Your Kidneys

You probably have at least three of these in your bathroom cabinet right now. They cost $10, they feel harmless, and in the wrong person, taken often enough, they can damage kidneys for years without a single warning sign. In this episode, Dr. Sean Hashmi walks through five classes of over-the-counter medications that quietly harm kidneys. NSAIDs (ibuprofen, naproxen, aspirin) block the prostaglandins that keep blood flow open into the kidney filter. A 2013 BMJ study of nearly half a million patients found that adding an NSAID to a diuretic plus an ACE inhibitor or ARB raised the rate of acute kidney injury by 31 percent, with the risk highest in the first 30 days. Proton pump inhibitors (Prilosec, Nexium, Prevacid) are linked to acute interstitial nephritis, an immune-driven inflammation that can scar the kidney if it goes unrecognized. A 2016 JAMA Internal Medicine study of 10,482 adults in the ARIC cohort found PPI users had a 20 to 50 percent higher risk of chronic kidney disease, replicated in a second cohort of nearly 250,000 patients. High-dose vitamin C supplements (1,000 mg or more daily) partially convert to oxalate in the liver, binding calcium in the urine and forming calcium oxalate crystals, the most common kidney stone. A 2013 study of 23,355 Swedish men found double the risk of kidney stones over 11 years. Cold and flu combination products stack NSAIDs with decongestants that constrict blood vessels and raise blood pressure. Hypertension is the second leading cause of kidney failure in the United States, accounting for 29 percent of new dialysis cases per USRDS data. Certain laxatives and antacids load the body with magnesium and phosphate that a weakened kidney cannot clear. The FDA issued a 2014 drug safety communication on sodium phosphate laxatives after cases of acute phosphate nephropathy that required dialysis. Dr. Sean Hashmi shares the exact mechanism behind each drug class, the specific patients most at risk, the 3-question checklist to run on every pill in your medicine cabinet, and the 30-second pharmacist conversation that could change your kidney trajectory. This is awareness, not self-prescribing. Do not stop any prescribed medication without consulting your physician. JOIN THE NEWSLETTER for weekly evidence-based kidney, metabolic, and longevity research: https://selfprinciple.org/newsletter Learn more about Dr. Sean Hashmi and SELFPrinciple.org, a 501(c)(3) nonprofit: https://selfprinciple.org CONNECT YouTube: https://youtube.com/@SeanHashmiMD Instagram: https://instagram.com/seanhashmimd DISCLAIMER The information in this content is for educational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have seen in this content. The views expressed here are my own and do not represent the views of my employer or any affiliated institution. Never start, stop, or change the dose of any prescription medication without consulting your physician.

What the FDA Just Approved Ozempic For Has Nothing to Do With Weight

A trial of 3,533 people with type 2 diabetes and chronic kidney disease was stopped early in late 2023. Not because something went wrong. Because the drug worked so well that leaving anyone on placebo was no longer ethical. That drug was Ozempic. Eight months later, the FDA approved semaglutide for a reason that has nothing to do with weight loss. In this episode, Dr. Sean Hashmi breaks down the FLOW trial, the diabetic kidney disease study that changed the standard of care. Patients on semaglutide saw a 24 percent reduction in the composite kidney outcome, a 38 percent drop in albuminuria, an 18 percent reduction in major adverse cardiovascular events, and a 20 percent reduction in all-cause mortality across three and a half years of follow-up. The patients in the trial were already on standard care: ACE inhibitors or ARBs, often metformin, sometimes SGLT2 inhibitors. The semaglutide benefit was stacked on top, and the effects were additive. Dr. Sean Hashmi covers the four mechanisms behind the kidney benefit. Glucose control reduces glycation and oxidative stress in the small vessels feeding the kidney. Weight loss of 10 to 15 percent at higher doses reduces the inflammatory load on every organ. Modest blood pressure reduction and natriuresis lower the force pushing on the inside of the kidney filter. And the mechanism that makes this drug a true kidney-saving therapy: GLP-1 receptors sit on immune cells, on the cells lining blood vessels, and inside the kidney itself, and activating them appears to dampen the chronic low-grade inflammation that drives diabetic kidney scarring. The episode walks through the four actionable steps every patient with type 2 diabetes and CKD should take before their next appointment. Pull the last lab panel and find the eGFR and the urine albumin-to-creatinine ratio. Bring the FLOW trial up at the visit with the exact words Dr. Sean recommends. Build a sick day plan at the prescribing visit because dehydration on a GLP-1 can spiral into acute kidney injury fast. Defend muscle mass with resistance training two or three sessions a week and adequate protein for your kidney stage. The one absolute contraindication: personal or first-degree family history of medullary thyroid carcinoma or multiple endocrine neoplasia. JOIN THE NEWSLETTER for weekly evidence-based kidney, metabolic, and longevity research: https://selfprinciple.org/newsletter Learn more about Dr. Sean Hashmi and SELFPrinciple.org, a 501(c)(3) nonprofit: https://selfprinciple.org CONNECT YouTube: https://youtube.com/@SeanHashmiMD Instagram: https://instagram.com/seanhashmimd DISCLAIMER The information in this content is for educational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have seen in this content. The views expressed here are my own and do not represent the views of my employer or any affiliated institution. Never start, stop, or change the dose of any prescription medication without consulting your physician.

Foamy Urine? Here's What It Actually Means

Foamy urine has a 1 in 5 chance of meaning your kidneys are leaking protein. Here's what kind of foam matters and the $30 test that catches it years before standard blood work. If you've been Googling foamy urine at midnight, zooming in on toilet bowls and wondering if it means kidney failure, this episode gives you the read your appointment didn't. ━━━━━━━━━━━━━━ Foamy urine has three patterns that matter: persistent foam that lingers more than a minute after flushing, dense soap-suds texture rather than a few large bubbles, and recurrence on most days for two to three weeks. When those three line up, the foam often points to albuminuria, the medical term for albumin protein leaking through the kidney's filters into the urine. Albumin is the specific protein that matters. Your kidneys are built to hold it in your bloodstream. When the glomerular filter is damaged by diabetes, high blood pressure, or autoimmune disease, albumin slips through and changes the surface tension of urine. That is where the foam comes from. Proteinuria, microalbuminuria, and albuminuria all describe versions of the same underlying leak. The catch: protein leak shows up in the urine years before creatinine moves on a standard blood test. A normal blood test does not rule out early kidney damage. The test that catches it is the urine albumin-to-creatinine ratio, UACR, a single spot urine sample at the lab, roughly $30 at most labs, no 24-hour collection needed. This episode covers the three foam patterns, why albumin leaks through the kidney filter, the exact UACR cutoffs to know, the words to use at your next appointment, and the treatments, ACE inhibitors, ARBs, SGLT2 inhibitors, and GLP-1 receptor agonists like semaglutide, that the evidence supports when albuminuria is found early. ━━━━━━━━━━━━━━ Chapters: 00:00 The 1 in 5 stat 00:32 Why foamy urine matters 01:02 Albumin: the protein that leaks 02:00 How often foam means kidney damage 02:54 Three patterns that separate harmless foam from kidney foam 04:05 Inside the kidney filter 05:25 Why diabetes and high blood pressure damage the filter 06:21 The UACR test explained 08:17 Why a leaking kidney is also a heart problem 08:52 The exact words to use at your appointment 09:11 Treatments the evidence supports 10:20 What to do this week ━━━━━━━━━━━━━━ Research cited: - Kang KK et al. (2012). Clinical significance of subjective foamy urine. Chonnam Medical Journal, 48(3):164-168. DOI: 10.4068/cmj.2012.48.3.164 - Matsushita K et al., Chronic Kidney Disease Prognosis Consortium (2010). Association of estimated glomerular filtration rate and albuminuria with all-cause and cardiovascular mortality in general population cohorts: a collaborative meta-analysis. The Lancet, 375(9731):2073-2081. DOI: 10.1016/S0140-6736(10)60674-5 - Heerspink HJL et al. (2020). DAPA-CKD Trial. Dapagliflozin in Patients with Chronic Kidney Disease. New England Journal of Medicine, 383(15):1436-1446. DOI: 10.1056/NEJMoa2024816 - Perkovic V et al. (2024). FLOW Trial. Effects of Semaglutide on Chronic Kidney Disease in Patients with Type 2 Diabetes. New England Journal of Medicine, 391(2):109-121. DOI: 10.1056/NEJMoa2403347 - CDC Chronic Kidney Disease Surveillance System. ━━━━━━━━━━━━━━ Connect: YouTube: youtube.com/@SeanHashmiMD Instagram: @SeanHashmiMD Newsletter: selfprinciple.org/newsletter Website: SELFPrinciple.org *Educational content, not medical advice.*

The 8 Glasses of Water Rule Is a Myth. Here's the Real Answer

How much water should you actually drink each day? As a board-certified nephrologist, the honest answer is: it depends on your body, your kidneys, your climate, and your activity. The "8 glasses a day" rule was never based on a single scientific study. In this episode, you'll learn why the popular hydration advice has no real evidence behind it, how your kidneys regulate water through ADH, and why chugging a gallon a day can actually be dangerous. You'll also hear what the CKD WIT trial revealed about water intake and kidney disease. This episode is for anyone who has ever carried a gallon jug to work, watched a hydration challenge online, or wondered if they are drinking too much or too little. ━━━━━━━━━━━━━━ EPISODE BREAKDOWN: [00:00] The Hydration Myth Most People Believe [01:07] Why the 8 Glasses Rule Has No Real Evidence [01:55] What Your Actual Daily Fluid Needs Look Like [03:09] How Your Kidneys Regulate Water [03:55] The Hidden Ceiling on How Fast You Can Drink [05:08] What the CKD WIT Trial Actually Showed [05:45] Hydration Targets by Kidney Stage [06:49] Use Your Urine Color as Real-Time Feedback [07:22] Spread Out Your Intake, Don't Chug [07:57] When Electrolytes Actually Matter [08:22] Your Action Plan ━━━━━━━━━━━━━━ KEY TAKEAWAYS: 1. The 8 glasses a day rule has no scientific study behind it. Total daily fluid from all sources, including food, usually falls between two and three liters for healthy adults. 2. Your kidneys can only excrete roughly 0.8 to 1 liter of free water per hour. Drinking faster than that can dilute your blood sodium and cause hyponatremia, which in severe cases is fatal. 3. Pale yellow urine is a more reliable hydration check than any number on a water bottle. ━━━━━━━━━━━━━━ RESEARCH CITED: Valtin H. (2002), American Journal of Physiology — No scientific evidence supports the "8 x 8" rule for healthy adults in temperate climates. Clark WF, Sontrop JM, Huang SH, et al. (2018), JAMA — CKD WIT trial: coaching to increase water intake did not slow eGFR decline in stage 3 CKD over 1 year. Hew-Butler T, et al. (2015), Clinical Journal of Sport Medicine — 3rd International Exercise-Associated Hyponatremia Consensus Statement. Institute of Medicine (2005), Dietary Reference Intakes for Water — Total fluid intake from all sources, including food. ━━━━━━━━━━━━━━ CONNECT: YouTube: https://www.youtube.com/@SeanHashmiMD Instagram: https://www.instagram.com/seanhashmimd/ Newsletter: https://www.selfprinciple.org/newsletter Website: https://www.selfprinciple.org *MEDICAL DISCLAIMER: This episode is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult your healthcare provider before making changes to your health routine.*

10 Foods That Protect Your Kidneys (Nephrologist Approved)

Kidney-friendly foods can either slow chronic kidney disease or speed it up, and most people have never heard the one number that explains why. Your body absorbs over 90% of phosphorus additives from processed food, but only 20 to 40% from whole plant foods. That single gap is the starting point for every food on this list. Board-certified nephrologist Dr. Sean Hashmi breaks down 10 evidence-based foods that reduce oxidative stress, lower inflammation, and ease the filtering burden on your kidneys. This episode is for anyone with early kidney disease, a family history of CKD, or rising creatinine who wants a practical, evidence-based food plan that does not feel like a medical prescription. ━━━━━━━━━━━━━━ EPISODE BREAKDOWN: [00:00] The phosphorus gap nobody talks about [00:45] The real enemy in your kitchen [01:15] Why kidney science shifted in 2020 [03:00] The three mechanisms [03:30] The 10 foods (with mechanisms) [05:00] Phosphorus label trick [06:30] Double-boiling potassium hack [08:00] How to build this into a real week [10:30] Your Action Plan ━━━━━━━━━━━━━━ KEY TAKEAWAYS: 1. Switching from processed phosphorus sources to whole-food phosphorus sources cuts the filtering burden on your kidneys without changing how much you eat. 2. A 2025 systematic review linked plant-dominant diets to lower CKD risk and slower progression, and separate CKD cohort data link healthful plant-based patterns to lower mortality. 3. An optimized double-boiling method can cut potassium in high-potassium vegetables by roughly half or more, which can put foods you were told to avoid back on your plate. ━━━━━━━━━━━━━━ RESEARCH CITED: Ikizler TA, et al. (2020), Am J Kidney Dis — KDOQI Nutrition Guidelines Canney M, et al. (2025), PMID 40081608 — Plant-based diets and CKD incidence and progression CKD cohort study, PMID 39305755 — Plant-based diet index and CKD mortality Williams G, et al. (2023), Cochrane Database Syst Rev — Cranberries for UTI prevention Nutr Res Pract (2024), PMC11422410 — Double-cooking method, potassium reduction in potatoes ━━━━━━━━━━━━━━ WATCH THE VIDEO VERSION: Full video on YouTube: https://www.youtube.com/@SeanHashmiMD ━━━━━━━━━━━━━━ LISTENER QUESTION: Which of these 10 foods is already in your kitchen? Drop a number in the Spotify Q&A. ━━━━━━━━━━━━━━ CONNECT: YouTube: https://www.youtube.com/@SeanHashmiMD Instagram: https://www.instagram.com/seanhashmimd/ Newsletter: https://www.selfprinciple.org/newsletter Website: https://www.selfprinciple.org *MEDICAL DISCLAIMER: This episode is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult your healthcare provider before making changes to your health routine. Listening does not establish a doctor-patient relationship. The views expressed are Dr. Hashmi's personal professional opinions and do not represent any employer or affiliated organization.*