I Used To Be Vegan

Is a low-fat vegan diet costing you muscle mass? I used to be a total cardio junkie and vegan, thinking I was doing the healthiest thing possible until a humiliating body composition test revealed my body fat had skyrocketed to 25%. Today, I am walking you through the physiological breakdown that occurs with chronic endurance training and inadequate protein, explaining why these habits can lead to a "muscle loss cocktail" and metabolic disaster. My goal is to share how shifting to a "muscle first" philosophy, incorporating resistance training, HIIT, and optimal amino acid balance, is the true key to aging powerfully. What you’ll learn: (02:00) Why chronic endurance training combined with a low-fat vegan diet led to muscle loss and increased body fat. (05:02) How prolonged endurance exercise can elevate cortisol and create a catabolic environment when recovery and protein intake are insufficient. (07:41) What research shows about muscle protein synthesis on vegan versus omnivore diets when protein intake is matched. (09:16) Why athletes require more protein than the standard RDA to preserve lean mass and support recovery. (10:52) How skeletal muscle mass directly influences resting metabolic rate and long-term fat burning. (12:13) Why muscle is the body’s primary site for glucose disposal and essential for insulin sensitivity. (15:19) How high-intensity interval training can stimulate mitochondrial growth and improve metabolic health in less time than traditional endurance training. (19:42) Why essential amino acids can act as “muscle insurance,” especially for women over 40 facing anabolic resistance. Love the podcast? Here’s what to do:

You can listen to I Used To Be Vegan online on Radio and Podcast. Open the player on this page to stream the available audio.

I Used To Be Vegan is an episode from Ask The Health Expert by JJ Virgin.

This episode is 26:52 long.

This episode was published on Mar 23, 2026.

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