Fat Burning Is Not Fat Loss: Dr. Abbie Smith-Ryan on Muscle, Fat Loss and Fasted Training for Women 40+

Dr. Abbie Smith-Ryan explains how muscle quality changes in perimenopause and how HIIT, heavy lifting and protein timing help women over 40 train smarter.

In perimenopause, muscle can shift from a lean "filet" toward a "rib eye," with more fat and connective tissue inside it, and a DEXA or InBody can't detect it. Dr. Abbie Smith-Ryan explains why heavier, higher power training recruits the type 2 fibers that fade with age, how 1 minute on, 1 minute off HIIT appears to reduce visceral fat in as little as three weeks, why fat burning is not fat loss, and when about 20g of protein before training helps.

WHAT YOU'LL LEARN

Why muscle quality, not just muscle size, may change first in perimenopause

How 1 minute on, 1 minute off HIIT targets visceral fat in midlife women

Why fat burning during zone 2 is not the same as fat loss

When training fasted costs you results, and when it does not

TIMESTAMPS

00:00 - Intro: Muscle Quality in Perimenopause and Why a DEXA Can't Measure It

06:31 - How to Train for Muscle Quality After 40: Heavy Load, Power and Type 2 Fibers

10:13 - HIIT and Visceral Fat in Midlife Women: The 1 Minute On, 1 Minute Off Protocol

16:01 - The 30 Minute Heavy Lifting Protocol, the Norwegian 4x4 and Where Zone 2 Fits

25:38 - Fasted vs Fed Training for Women 40+: Protein Before or After Exercise

37:58 - Losing Leg and Glute Definition, HRT and Why Your Symptoms Are Valid

44:28 - Fiber, Omega-3s and Creatine Dosing for Muscle and Brain in Perimenopause

54:05 - Perimenopause Is a Metabolic Transition: Final Advice

VALUABLE RESOURCES

Effects of high-intensity interval training on cardiometabolic risk factors in overweight/obese women, Journal of Sports Sciences (Smith-Ryan et al. (2016)) https://doi.org/10.1080/02640414.2016.1149609

The acute effect of exercise modality and nutrition manipulations on post-exercise resting energy expenditure and respiratory exchange ratio in women, Sports Medicine (Wingfield et al. (2015)) https://doi.org/10.1186/s40798-015-0010-3

The effects of nutrient timing on training adaptations in resistance-trained females, Journal of Science and Medicine in Sport (Pihoker et al. (2018)) https://doi.org/10.1016/j.jsams.2018.09.236

Metabolic effects of high-intensity interval training and essential amino acids, European Journal of Applied Physiology (Hirsch et al. (2021)) https://doi.org/10.1007/s00421-021-04792-4

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ABOUT THE GUEST

Dr Abbie Smith-Ryan is an exercise physiologist and researcher in the Department of Exercise and Sport Science at the University of North Carolina at Chapel Hill, where she leads the Applied Physiology Laboratory. Her research focuses on how high-intensity training, nutrient timing and supplementation such as creatine shape muscle quality, body composition and metabolic health in women, with a growing focus on perimenopause.