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Optimal Protein Podcast with Vanessa Spina

Protein Sparing Modified Fasting Days Explained: Maria Emmerich's Science-Backed Fat Loss Method to Preserve Muscle + Sharing Her Courageous Weight Regain Journey

Optimal Protein Podcast with Vanessa Spina

Vanessa Spina

Fitness, Health & Fitness, Nutrition

4.5758 Ratings

🗓️ 22 September 2025

⏱️ 74 minutes

🧾️ Download transcript

Summary

Content Note / Trigger Warning: The first two-thirds of this episode focus on Maria Emmerich's expertise in helping thousands of people who are overweight, obese, or struggling with metabolic health to lose weight and dramatically improve their health and lives. In the last third of the interview, Maria shares her very recent personal experience with struggling with restrictive dieting, and her courageous journey of weight regain. Please listen with care if these topics around disordered eating may be sensitive or triggering for you. See *RESOURCE below if you or someone you care about needs support.

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Today's guest is Maria Emmerich, internationally renowned nutritionist, best-selling author, and an expert in her version of integrating 1-2 Protein Sparing Modified Fast Days (PSMF Days) in a week to create a weekly caloric deficit while protecting muscle and metabolism, including re-feed days to balance out the week.

In this episode, we cover:

  • What PSMF Days are and how they differ from the sugar diet or fasting
  • How PSMF Days preserve lean muscle while accelerating fat loss
  • The role of stall foods like nuts, dairy, and nut flours in holding back fat loss
  • Client strategies for satiety, electrolytes, and exercise integration
  • The science behind metabolic adaptation, and refeeds
  • Why higher protein intake and supplements like creatine are key for recomposition
  • Maria's personal story of becoming too lean, regaining weight, and how it reshaped her coaching philosophy

This episode is packed with practical strategies from Maria's decades of experience helping people transform their health — and also offers a very candid look into her own personal journey.

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Connect with Vanessa on Instagram @ketogenicgirl

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Follow @optimalproteinpodcast on Instagram to see visuals and posts mentioned on this podcast.

Link to join the Facebook group for the podcast

The content provided in this podcast is for informational purposes only and should not be construed as medical advice. Consult with a healthcare professional before making significant changes to your diet or exercise regimen.

*RESOURCE: If you are in the United States and you or someone you love is struggling with disordered eating, support is available. You can call the National Eating Disorders Association (NEDA) Helpline at 1-800-931-2237 or visit nationaleatingdisorders.org for resources.

Transcript

Click on a timestamp to play from that location

0:00.0

Welcome to the Optimal Protein Podcast. I'm Vanessa Spina.

0:04.4

Hello, my friends. Welcome back to the podcast. I'm your host Vanessa. And today I'm thrilled to be

0:09.7

joined once again by the one and only Maria Emric. Maria is one of the foremost voices in the

0:17.2

ketogenic and protein focused nutrition space, and she has helped thousands of people

0:22.4

transform their health and body composition with her protein sparing modified fasting days

0:28.6

approach. In this episode, we go deep into how protein sparing modified fasting works,

0:34.4

why eating lean protein can accelerate fat loss without sacrificing muscle.

0:39.9

She explains exactly how she uses protein sparing modified fasting days with her clients,

0:46.1

the common food stalls that she sees holding people back, and the science behind why this

0:52.0

does not create starvation mode. We also cover metabolic adaptation, the role of

0:57.5

refeeds, why you shouldn't do more than two or three protein sparing days in a week, and why

1:04.0

higher protein is crucial for the right kind of weight loss, body recomposition, which is fat loss and retaining your lean mass

1:13.2

and muscle. And we talk about how all of this can be a game changer for women in the peri or post

1:20.1

menopause phases as well. In a very candid part of our conversation, Maria also opens up about

1:26.3

her own personal journey, including the

1:29.2

period when she became too lean very recently, what she learned about herself in this process,

1:37.0

why she is now working on regaining weight, and how that experience has reshaped her

1:43.3

coaching philosophy. Now, this is a very powerful

1:46.6

part of the episode and I really appreciate Maria for being so brave and opening up about

1:52.6

her struggles, her very personal struggles. For anyone who is sensitive to content around

1:58.2

disordered eating or being very low weight, this may be a part of the interview at the end of the episode that you may want to skip.

2:06.6

Now, this is a very powerful episode full of practical strategies from someone who is a very seasoned expert in weight loss and in fat loss, including a lot of myth busting and personal

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