DiscoverChasing Clarity: Health & Fitness PodcastRAPID FAT LOSS REVISITED: LYLE MCDONALD’S UPDATED INSIGHTS ON PROTEIN-SPARING MODIFIED FASTS | EP. 176
RAPID FAT LOSS REVISITED: LYLE MCDONALD’S UPDATED INSIGHTS ON PROTEIN-SPARING MODIFIED FASTS | EP. 176

RAPID FAT LOSS REVISITED: LYLE MCDONALD’S UPDATED INSIGHTS ON PROTEIN-SPARING MODIFIED FASTS | EP. 176

Update: 2025-08-20
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MOST PEOPLE HAVE HEARD OF “RAPID FAT LOSS” DIETS…BUT FEW UNDERSTAND THE SCIENCE BEHIND THEM.


On this week’s episode of the CHASING CLARITY HEALTH & FITNESS PODCAST, I’m joined by none other than Lyle McDonald, author of The Rapid Fat Loss Handbook and one of the greatest thought leaders in evidence-based nutrition.


Together, we dig into the origins, evolution, and practical application of Protein-Sparing Modified Fasts (PSMFs) and Lyle’s updated insights on RFL. 


HERE’S WHAT WE COVER:

WHAT IS A PROTEIN-SPARING MODIFIED FAST (PSMF) & HOW DOES IT WORK?

THE HISTORY OF VERY-LOW-CALORIE DIETS (VLCD) & THE ORIGINS OF PSMF

WHAT INSPIRED LYLE MCDONALD TO WRITE THE RAPID FAT LOSS HANDBOOK?

HOW RFL IMPROVES UPON THE CLASSIC PSMF MODEL

WHY PROTEIN NEEDS TO SCALE UP DURING A CALORIE DEFICIT

HOW A DEFICIT IMPACTS MUSCLE PROTEIN BALANCE (MPS VS. MPB)

HOW TO SET PROTEIN INTAKE ON RFL BASED ON BODY FAT % & ACTIVITY LEVEL

ESSENTIAL FATTY ACIDS ON RFL- WHY EPA & DHA ARE NON-NEGOTIABLE

FOOD SOURCES VS SUPPLEMENTATION FOR OMEGA-3S DURING RAPID FAT LOSS

WHY VEGETABLES MATTER ON RFL

WHOLE FOODS VS LIQUID DIETS IN RAPID FAT LOSS PROTOCOLS

HOW TO SCALE THE DEFICIT SIZE BASED ON BODY FAT PERCENTAGE & ACTIVITY

WHO SHOULD NOT USE A RAPID FAT LOSS APPROACH (CONTRAINDICATIONS)


This is an updated look at a topic Lyle originally wrote about in 2005 and last published on in 2008 so after more than 20 years of digging into Rapid Fat Loss, I’m excited to share what he has and hasn’t changed about this approach.


Tune in now and get clarity on the most misunderstood fat loss method in the industry.


WHERE TO CONNECT WITH ME:


Follow Brandon on IG: https://www.instagram.com/brandondacruz_/


For Info on Brandon’s Coaching Services: https://form.jotform.com/bdacruzfitness/coachinginquiry


Email: Bdacruzfitness@gmail.com


Brandon’s Website: https://www.brandondacruzfit.com



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RAPID FAT LOSS REVISITED: LYLE MCDONALD’S UPDATED INSIGHTS ON PROTEIN-SPARING MODIFIED FASTS | EP. 176

RAPID FAT LOSS REVISITED: LYLE MCDONALD’S UPDATED INSIGHTS ON PROTEIN-SPARING MODIFIED FASTS | EP. 176

Brandon DaCruz