Amino Acids, Creatine, Muscle Loss and Midlife Metabolism with Liz Plosser

You’re eating “pretty well.” You’re moving your body.

So why does it feel like your muscle is disappearing and your effort is not paying off the way it used to?

In this episode, I sit down with Liz Plosser, former editor-in-chief of Women’s Health and a woman who has spent her entire career reporting on health, fitness, strength, and performance.

We talk about what changes in midlife, why the old fitness rules stop working, and why women in perimenopause and menopause need to think differently about muscle, protein, amino acids, creatine, strength training, and metabolism.

Liz shares how perimenopause changed her own approach to fitness after years as a cardio-focused marathoner, and how an injury eventually led her to fall in love with strength training and chase a 280-pound deadlift PR.

Then we go deep on essential amino acids: what they are, why your body needs all nine of them, and why they may be one of the smartest and simplest tools women can add to support muscle in midlife.

We also break down the difference between amino acids and creatine, why BCAAs may not be worth your money, and how to build a realistic supplement routine that fits a real life, not a biohacker’s spreadsheet.

If you have ever felt like your body stopped responding to the things that used to work, this episode will help you understand why, and more importantly, what to do about it.

Listen to the Full Episode:

In This Episode, We Cover:

• How perimenopause changed Liz Plosser’s approach to fitness after decades as a cardio-focused marathoner
• Why muscle loss accelerates in midlife and what that means for metabolism, strength, and aging
• The injury that led Liz to fall in love with strength training and chase a 280-pound deadlift PR
• Why it is okay to want to look strong, lean, and confident, not just “healthy”
• What essential amino acids are and why your body needs all nine
• Why women may become less efficient at using protein and amino acids as estrogen declines
• The difference between amino acids and creatine, and why many women may benefit from both
• Why branched-chain amino acids, or BCAAs, may not be worth the hype or the money
• New research conversations around creatine and brain health, including higher doses on high-demand days
• How to build a simple, realistic daily protein and supplement routine
• Why amino acids may be especially helpful for women on GLP-1 medications who are eating less

Why Muscle Loss Happens in Perimenopause and Menopause

Many women reach midlife and suddenly feel like their body is not responding the way it used to.

They are eating well. They are exercising. They are trying.

But the muscle tone starts to fade, belly fat becomes more stubborn, recovery takes longer, and workouts that used to deliver results no longer feel as effective.

This is not just about willpower.

During perimenopause and menopause, changes in estrogen, protein metabolism, insulin sensitivity, sleep, stress, and activity patterns can all affect muscle maintenance and body composition.

This is why midlife women need a more intentional strategy around protein, strength training, amino acids, creatine, and recovery.

What Are Essential Amino Acids?

Essential amino acids are the amino acids your body cannot make on its own, which means you need to get them from food or supplementation.

They are the building blocks your body uses to repair and build muscle, support recovery, maintain strength, and protect lean tissue.

Protein is important, but your body needs the full spectrum of essential amino acids to use that protein properly. This is one reason essential amino acid supplements can be helpful for women who struggle to eat enough protein, have reduced appetite, are on GLP-1 medications, or want extra support for muscle maintenance in midlife.

Amino Acids vs. Creatine: What Is the Difference?

Amino acids and creatine are not the same thing, and they do different jobs.

Essential amino acids help provide the building blocks for muscle repair and muscle protein synthesis.

Creatine helps support cellular energy, strength, power output, muscle performance, and may also have benefits for brain energy and cognition.

For many midlife women, the question is not necessarily amino acids or creatine. It may be both, depending on their goals, diet, training, muscle mass, and overall health picture.

Why BCAAs May Not Be Enough

BCAAs, or branched-chain amino acids, include only three amino acids: leucine, isoleucine, and valine.

While these amino acids are important, they are not the complete picture.

Your body needs all nine essential amino acids to fully support muscle repair and muscle protein synthesis. This is why many experts prefer a complete essential amino acid supplement over a basic BCAA product.

In plain English: BCAAs may start the signal, but they do not provide the full building materials.

Why Amino Acids Matter If You Are on a GLP-1

GLP-1 medications can be powerful tools for appetite regulation and weight loss, but many women find they are eating less overall.

That can be helpful for fat loss, but it can also make it harder to get enough protein and nutrients to protect muscle.

This is why women on GLP-1s need to be especially intentional about protein, amino acids, strength training, creatine, and muscle preservation.

The goal is not just to lose weight. The goal is to lose fat while protecting strength, metabolism, and long-term health.

This Episode Is For You If:

• You feel like your body is not responding the way it used to
• You are in perimenopause or menopause and noticing muscle loss
• You are confused about protein, amino acids, BCAAs, or creatine
• You want to build or maintain muscle in midlife
• You are tired of conflicting advice from every corner of the internet
• You are taking a GLP-1 medication and want to protect muscle while eating less
• You want a simple supplement routine that actually fits real life
• You want to feel strong, lean, capable, and confident as you age

Episode Resources

Visit getkion.com/hormone for 20% off.

FAQ Section

Why do women lose muscle in perimenopause and menopause?

Women may lose muscle in perimenopause and menopause because of hormonal changes, declining estrogen, reduced protein efficiency, lower activity levels, poor sleep, stress, and changes in metabolism. This is why strength training, protein, amino acids, and recovery become more important in midlife.

What are essential amino acids?

Essential amino acids are the nine amino acids your body cannot make on its own. They must come from food or supplements and are needed for muscle repair, recovery, and muscle protein synthesis.

Are amino acids the same as protein?

No. Protein is made up of amino acids. When you eat protein, your body breaks it down into amino acids and then uses those amino acids to build and repair tissues, including muscle.

What is the difference between amino acids and creatine?

Amino acids are building blocks for muscle repair and muscle protein synthesis. Creatine helps support cellular energy, strength, power, muscle performance, and may also support brain energy. They work differently, and many women may benefit from both.

Are BCAAs worth taking?

BCAAs include only three amino acids: leucine, isoleucine, and valine. While they are important, they do not provide all nine essential amino acids. For muscle support, a complete essential amino acid supplement is often more useful than BCAAs alone.

Why are amino acids helpful for women on GLP-1 medications?

Women on GLP-1 medications often eat less because appetite is reduced. This can make it harder to get enough protein and nutrients. Essential amino acids may help support muscle preservation when paired with adequate protein, strength training, and a well-planned diet.

Is creatine helpful for women in menopause?

Creatine may be helpful for women in menopause because it supports strength, muscle performance, cellular energy, recovery, and may also play a role in brain energy and cognition. It is especially useful when paired with strength training.

How can midlife women protect muscle while losing weight?

Midlife women can protect muscle by prioritizing protein, lifting weights, getting enough essential amino acids, considering creatine, sleeping well, managing stress, and avoiding overly aggressive dieting. The goal is fat loss while maintaining strength and metabolism.