What to Eat After a Fasted Workout—and Why Energy Drinks May Affect Heart Rhythm: Registered dietitian nutritionist Leyla Muedin discusses what to eat after exercise, especially morning fasted workouts, advising water first and avoiding sweet or carb-rich post-workout options (smoothies, bananas, flavored yogurts, cereal, sports drinks) because they can raise blood sugar and insulin, reduce fat burning by suppressing glucagon, and blunt exercise-related benefits like human growth hormone; instead she recommends a savory protein-and-fat meal (e.g., a 3–4 egg omelet, steak, chicken salad without bread) within 45–60 minutes to support muscle repair while keeping insulin low. She then reviews a 2025 systematic review of 37 studies (1,597 participants; average age 22.5) in which 63.2% of studies reported QT prolongation after energy drink consumption, with frequent increases in blood pressure and heart rate, noting that the findings show repeated measurable cardiovascular changes but do not prove energy drinks cause heart disease.

Time-Restricted Eating Study: Nutritionist Leyla Muedin details a Johns Hopkins Medicine study (published July 27 in Obesity) on time-restricted eating (TRE), a form of intermittent fasting that limits eating to a consistent 8–10 hour daily window, in adults with obesity and prediabetes or diet-controlled type 2 diabetes. In a 12-week trial of mostly female and Black participants, groups followed either a 10-hour TRE schedule or a usual 16-hour eating pattern, while all received a provided, personalized-calorie DASH diet intended to maintain starting weight. Both groups experienced similar modest weight loss and reported improved eating behaviors (more restraint, less stress eating, less hunger), with no differences in appetite hormones (ghrelin, leptin) or inflammation markers (CRP, cortisol). Leyla argues a higher-carb DASH diet may have limited measurable benefits and suggests repeating the study with a true low-carbohydrate diet; she also explains how fasting periods can lower insulin, support fat burning, and improve sleep by avoiding late meals.

Concurrent Training for Healthy Aging and the Overlooked B12 Risk of Metformin: Nutritionist Leyla Muedin discusses how concurrent training—combining cardio and strength work—supports healthy aging by building endurance, preserving muscle, and maintaining independence and “healthspan.” She explains that aerobic exercise improves cardiorespiratory efficiency while resistance training preserves lean tissue and functional strength, and offers practical scheduling tips: place strength sessions on two non-consecutive days, add moderate cardio around them, separate hard sessions, prioritize recovery with rest days, sleep, and adequate protein, and avoid pairing heavy lifting with hard endurance work if explosive power is important. She then summarizes evidence that clinicians often fail to check vitamin B12 levels in diabetic patients on long-term metformin, despite guidelines; metformin can impair B12 absorption, leading to deficiency, anemia, and potentially reversible neuropathy, with higher risk in the elderly, high-dose users, vegans, and PPI users. She urges proactive B12 monitoring and supplementation, such as a multivitamin with at least 100 mcg B12.

Nutritionist Leyla Muedin answers a listener question about taking many supplements with oolong tea, explaining that tea tannins can interfere with vitamin and mineral absorption; because oolong is partially oxidized, its tannin level falls between green and black tea, so she recommends taking supplements with water and separating them from tea or coffee by at least an hour (ideally 1.5–2 hours). She then reviews research in Nature Communications from USC on how gut signals via the vagus nerve may influence which food experiences become memories: in rats, nutrient-rich foods increased acetylcholine signaling to the hippocampus, supporting memory for food location, while sweetness without calories did not. Over time, high-fat/high-sugar diets weakened this gut–hippocampus communication and memory performance, with implications for obesity, diabetes/prediabetes, and cognitive decline, and possible future vagus-nerve-based approaches.

Exercise, Recovery, Relaxation—and Muscle as the Key to Healthy Aging: Nutritionist Leyla Muedin discusses science-backed wellness trends that pair exercise with effective recovery and deliberate relaxation to support performance, resilience, and healthy aging, noting benefits such as fewer overuse injuries, better sleep, steadier energy, and improved adherence. She highlights relaxation practices (breathwork, meditation, gentle yoga, outdoor time, massage, consistent sleep routines) and encourages making recovery part of daily life, including creating home or community “wellness spaces” like pools for gentle movement and stress reduction. She emphasizes sustainable habits supported by tools like wearables and heart-rate variability tracking. The episode then frames muscle as a “longevity secret weapon,” explaining its roles in metabolism, glucose storage, insulin sensitivity, inflammation control, and joint stability, citing the PURE study on grip strength and mortality, warning about sarcopenia, and recommending strength training, higher and well-distributed protein intake with age due to anabolic resistance, plus adequate sleep and recovery.

Food as Medicine: Why Medical Nutrition Therapy and Medically Tailored Meals Belong in Modern Healthcare: Registered dietitian nutritionist Leyla Muedin argues that food should be treated with the same rigor as medication through medical nutrition therapy (MNT) and “diet prescriptions,” integrating nutrition into treatment plans rather than leaving it as optional advice. She cites evidence that medically tailored meals (MTMs) can improve outcomes and reduce costs, including a Health Affairs simulation estimating $23.7B in first-year net savings nationwide and a Nature Medicine analysis of a Massachusetts Medicaid demonstration (2020–2023) showing MTM recipients had 31% fewer hospitalizations, 20% fewer emergency visits, and $3,433 lower total healthcare costs, offsetting 98% of program costs. She discusses food insecurity, expanding Medicaid coverage via Section 1115 waivers, EHR integration, and how MTMs support adherence for conditions such as diabetes, cardiovascular disease, chronic kidney disease, depression, and IBS (including low FODMAP).

Supplements and Morning Coffee: Timing Iron, Zinc, Calcium, B Vitamins, and Vitamin D: Nutritionist Leyla Muedin explains that coffee (and tea) can interfere with nutrient absorption and digestion, so certain supplements shouldn’t be taken with morning coffee. Coffee’s tannins and polyphenols can significantly reduce non-heme iron absorption (decaf doesn’t prevent this), and similar binding issues may affect zinc; she recommends taking iron with water at least 1–2 hours away from coffee and pairing it with vitamin C. Because caffeine may increase urination, B vitamins (especially thiamine) may be lost more readily, so she suggests taking them with food but not with coffee. Vitamin D is best taken with a fat-containing meal (not washed down with coffee), and calcium supplements should be separated from coffee since caffeine can slightly increase calcium loss. She also notes interactions such as green tea reducing folate absorption, spinach oxalates limiting mineral absorption, phytates in bran/legumes reducing iron and zinc absorption, and calcium (milk or supplements) cutting iron absorption, emphasizing timing rather than eliminating these foods.

Managing High Homocysteine with MTHFR Variants and the Role of Vitamin C in Brain Aging: Registered dietitian nutritionist Leyla Muedin discusses MTHFR genetic variants (C677T and A1298C), their links to impaired methylation, homocysteine, SAMe, mood issues, migraines, vitamin deficiencies, and pregnancy complications, noting many people are asymptomatic and some feel worse on methylated B vitamins and do better on standard formulations. Responding to a listener with C677T, high homocysteine, and borderline methylmalonic acid, she reviews optimal homocysteine targets and outlines other causes of elevated homocysteine such as hypothyroidism/subclinical hypothyroidism, kidney failure, obesity, hypertension, diabetes, smoking, inactivity, and medications (atorvastatin, methotrexate, fenofibrate). She suggests checking these factors, considering absorption issues (intrinsic factor) for B12, and trialing SAMe and more trimethylglycine, with possible pharmacologic folate if needed. She then summarizes an observational Japanese study (n=2,044 adults >64) linking lower plasma vitamin C to reduced gray matter and weaker default mode network connectivity, and notes diet and blood sugar can affect vitamin C status.

Lowering A1C in Prediabetes and Using Less Insulin on a Low-Carb Diet: Leyla Muedin, a registered dietitian nutritionist, answers listener questions about blood sugar and insulin. Responding to Rita, whose hemoglobin A1C rose from 5.6 to 5.8, Layla says “glucose hacks” to blunt carb absorption aren’t appropriate at that level and recommends a strict very low-carb/keto approach (under 25 grams of total carbs per day), avoiding sugar, starchy vegetables, fruit (except avocado), sweetened beverages, and even alternative sweeteners and low-carb processed products; she suggests retesting A1C after three months and avoiding testing during illness or inflammation. She also addresses Joy, a type 1 diabetic, affirming low-carb eating to reduce insulin needs and weight gain, criticizing an insurance pricing structure that charges more when insulin is used more slowly, and expressing concern about doctors prescribing insulin too quickly for type 2 diabetes instead of dietary intervention.

Leyla Muedin, a registered dietitian nutritionist in New York City, discusses the growing shift from symptom-only “sick care” to a clinically grounded holistic approach to health and recovery. She argues that self-guided wellness routines can leave gaps when underlying medical issues, mental health conditions, substance use disorders, or trauma remain unaddressed, and emphasizes integrating evidence-based clinical evaluation (including labs and deficiency testing) with lifestyle practices. She explains how treating symptoms in isolation misses connections (e.g., stress, sleep, grief) and defines true holistic care as addressing physical, mental, emotional, relational, environmental, and purpose-related factors without rejecting medical treatment. Key components include consistent movement, individualized nutrition built on basics, nervous system regulation (sleep, nature, breathing, meditation/prayer), meaningful social connection, and a sense of purpose as clinically relevant to resilience.