Q&A Deep Dive: Measuring Fat Loss, Testosterone vs. GainzZz, the Carnivore Diet, and More

🎙️ Q&A Deep Dive: The Critical Cutoff for Fat Loss, Safety, and Strength

📝 Episode Summary: BMI, Training Safety, and Evidence-Based Nutrition

In this mini-sode, Dr. Jordan Feigenbaum answers core questions on performance and health. The discussion centers on replacing arbitrary body fat percentages with clinical, evidence-based metrics for determining when a lifter should start a fat loss phase, emphasizing BMI and waist circumference.

Dr. Feigenbaum also provides critical safety information on heavy barbell training for older men, addresses the mythology of testosterone and its role in strength gains, outlines a strategy for losing weight without losing strength through modest deficits and high protein, and critiques the common use cases for stretching and the risks of the popular carnivore diet.

⏱️ Episode Timestamps

• [00:00] Introduction & Barbell Medicine Plus Offer
• [00:43] Body Fat Percentage vs. Clinical Metrics for a Cut (BMI and Waist Circumference)
• [07:22] The Clinical Use of Stretching and Injury Risk (Entry point for pain)
• [09:51] Losing Weight Without Losing Strength (Modest deficit & high protein)
• [13:19] Heavy Barbell Training and Heart Problems in Older Men (Cardiac safety)
• [15:00] Favorite Testosterone Factoid and Relative Strength Gains (Androgen receptor saturation)
• [17:18] The Problem with the Carnivore Diet (Saturated fat and fiber risks)

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⚕️ Section I: Body Composition and the Fat Loss Trigger

Replacing Body Fat Percentage with Clinical Markers

Dr. Feigenbaum critiques the common practice of using arbitrary body fat percentage thresholds (e.g., 25% for men) to recommend a fat loss phase, citing the lack of robust evidence correlating these numbers to disease risk and the poor accuracy of most measurement methods for tracking individual change.

Instead, the decision to recommend a cut for the average recreational lifter should rely on three objective, clinical criteria:

1. BMI > 30: A Body Mass Index of 30 or over is highly specific for excess adiposity. Outside of anabolic-using athletes (a statistical aberration), this is a "do not pass go" line in the sand.
2. Waist Circumference: For men, a waist circumference above 37 inches (particularly in those of European descent) is a stronger marker of visceral fat and increased risk.
3. Adiposity-Based Chronic Disease (ABCD): The presence of medical conditions linked to excess body fat, such as high blood pressure (strength training and hypertension guidelines), dyslipidemia, or elevated fasting blood sugar.

Strategy for Losing Weight While Retaining Strength

The goal of losing weight without losing strength (e.g., 105 kg to 97 kg) is achievable through careful moderation of training and diet:

• Calorie Deficit: Maintain a modest calorie deficit (under 200 calories) below maintenance. Going too fast risks losing more muscle mass.
• Protein Intake: Keep protein high, targeting 1.4–1.6 g/kg of body weight per day.
• Training Resilience: Research shows humans are resilient to maintaining performance in a short-to-medium-term energy deficit, provided the training is correctly moderated in both dose and formulation (prioritizing quality over high volume). Avoid overly restrictive diets like keto, which are detrimental to strength and muscle retention.

🏋️ Section II: Training Safety and Hormones

Heavy Barbell Training and Heart Health in Older Men

The concern that heavy barbell training for men in their late 40s or 50s could cause heart problems (e.g., PACs or other abnormalities) is directly refuted by evidence.

• Resistance Training is Safe: Cardiac adaptations from res