EP 65: Don't Wait for Symptoms: What's Missing From Your Blood Work | Dr. Dennis Hughes

Episode Summary Most routine blood panels leave critical information on the table. In this episode, Jeremy sits down with returning guest Dr. Dennis Hughes, a board-certified internist specializing in longevity and proactive healthcare, to break down what a more comprehensive, forward-looking blood panel actually looks like. They discuss why preparation before your draw matters as much as the tests themselves, how to detect insulin resistance long before it becomes type 2 diabetes, what advanced lipid markers like ApoB reveal beyond standard cholesterol panels, and how vascular health connects to cognitive decline, hormonal function, and long-term independence. This is a practical, grounded conversation about taking ownership of your internal health data, advocating for deeper testing, and making informed decisions early rather than reacting later. Guest Bio Dr. Dennis Hughes is a board-certified internist specializing in longevity and proactive health care. With a keen focus on cognitive health, he integrates cutting-edge diagnostics with tailored lifestyle strategies to help patients optimize their long-term wellness. Dr. Hughes recently relocated his practice to Montecito, where he offers both one-off consultations and ongoing membership care. Links Dr. Dennis Hughes Website: DennisHughesMD.com Contact Dr. Hughes: [email protected] InsideTracker: insidetracker.com Three Actionable Takeaways Prepare properly before your blood draw. Start hydrating the day before, ensure your urine is clear by morning, stop biotin-containing supplements a week out, and keep your regular medications and coffee routine. Good preparation means your results actually reflect your health, not your hydration status. Ask for the tests that predict trouble before you feel it. Tests like fasting insulin, ApoB, and cystatin C can reveal insulin resistance, cardiovascular risk, and kidney strain years before symptoms appear. Knowing your trajectory early gives you real options to change it. Be an active participant in your health care. Come to appointments with questions, track your results over time, and build a real partnership with your provider. You have one life and one body, and the difference between thriving in your later years and a slow decline often comes down to how engaged you are right now. 10 Key Insights Hydration directly affects the accuracy of your labs. Dehydration can artificially concentrate your blood, masking anemia and falsely elevating markers like creatinine, leading your doctor down the wrong diagnostic path. Consistent fasting and preparation across draws is essential for longitudinal tracking. If your preparation changes between blood draws, you lose the ability to compare results meaningfully over time. Insulin is the canary in the coal mine for metabolic stress. Elevated fasting insulin signals that your pancreas is working harder to compensate for insulin resistance, even when blood glucose still looks normal. Dr. Hughes targets an optimal fasting insulin below 6. ApoB is the most important lipid marker most doctors don't order. Rather than measuring total cholesterol packed into LDL particles, ApoB counts the actual number of LDL carrier particles, giving a far more accurate picture of cardiovascular risk. It is inexpensive and widely available. Insulin resistance changes the size and number of LDL particles for the worse. It shifts LDL from large, buoyant particles to smaller, denser, and more numerous ones that penetrate artery walls more easily, accelerating cardiovascular disease. What is happening in your heart is happening in your brain. The micro-vessels feeding brain tissue are far smaller than coronary arteries, making them even more vulnerable to vascular disease driven by insulin resistance and poor lipid profiles. Protecting your cardiovascular system is protecting your cognitive health. Iron deficiency can cause significant fatigue even without anemia. You must cross a threshold before anemia shows up on a standard CBC, but your mitochondria are already struggling to produce energy well before that point. An iron panel should be routine. A full thyroid panel, including antibody screening for Hashimoto's thyroiditis, is more informative than TSH alone. Hashimoto's is the most common cause of hypothyroidism and can go undetected for years, silently draining energy and function. Testosterone matters for both men and women, and bioavailable testosterone is the most clinically meaningful number. Total testosterone only tells part of the story. Free and bioavailable testosterone reflect what is actually available to your tissues, and tracking all three gives a far more complete hormonal picture. Fatty liver is not a benign finding, even with normal standard liver tests. Driven by insulin resistance, it exists on a spectrum from hepatic steatosis to inflammation to fibrosis, and may become the leading cause of cirrhosis. If you have been told you have fatty liver, dig deeper.