PSMF 101: How to Burn Body Fat While Protecting Muscle with Craig Emmerich

What exactly is a protein-sparing modified fast—and how can it accelerate fat loss without sacrificing precious lean mass?

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In this episode of the PSMF series, Vanessa is joined by Craig Emmerich, co-author of The Art of Fat Loss, for a step-by-step guide to protein-sparing modified fasting. They break down how a PSMF differs from a traditional fast, how to determine your protein target, why dietary fat is kept low and how to incorporate PSMF days into a sustainable weekly plan.

Craig explains why protein's powerful thermic effect and satiating properties make it uniquely valuable during fat loss. He also challenges the idea that higher blood ketones automatically mean greater fat loss—and explains why adding more dietary fat to "increase ketosis" can sometimes work against body-composition goals.

They also discuss what happens to dietary fat after we eat it, why calories and hormones both matter, how dairy and nuts may contribute to a fat-loss plateau and why PSMF can be an effective short-term tool for breaking a stall.

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In this episode, you'll learn:

What a protein-sparing modified fast is—and what "protein sparing" actually means
How PSMF differs from water-only fasting
How protein helps preserve lean mass during an energy deficit
How to estimate your daily protein target using lean body mass
Why PSMF days typically keep carbohydrates and dietary fat very low
How often Craig recommends incorporating PSMF days
What to eat on the days between protein-sparing fasts
The role of strategic higher-energy days
Why dairy and nuts can make fat loss more difficult for some people
How protein's thermic effect influences net energy intake
Why a very high-protein day can be surprisingly satiating
Why low blood ketones do not mean a PSMF—or ketogenic diet—isn't working
The difference between producing ketones and efficiently using them
Why free fatty acids provide much of the body's energy during ketosis
What happens to dietary fat after it enters the bloodstream
Why dietary fat can be treated as an adjustable "energy lever"
How high-fat keto can stall fat loss even when carbohydrates and insulin remain low
Why calories, food quality, satiety and hormonal health all matter
How PSMF may help break through a stubborn fat-loss plateau

Whether you're new to protein-sparing modified fasting or want to refine your current approach, this conversation provides a practical foundation for using higher protein and lower dietary energy to support fat loss while protecting metabolically active lean tissue.

About Craig Emmerich

Craig Emmerich is an author and nutrition educator who works alongside his wife, Maria Emmerich, to help people implement ketogenic and protein-focused nutrition. Together, they are the authors of The Art of Fat Loss and numerous books and resources on ketogenic living.

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