Muscle & Protein for PMOS: What the Research Actually Shows

Diagnosis is just the start. The question that actually matters is what happens next.

New research points to two things you can act on directly, starting today: building muscle, and eating enough protein to support it. This isn't about aesthetics - it's a direct, physiological lever on metabolic health, supporting the "M" in PMOS (previously known as PCOS).

Why this matters to women

PMOS (the condition most people still know as PCOS) affects an estimated one in ten women, yet women's health research has long been underfunded and under-studied compared to conditions that affect men equally or more. For a long time, the focus stayed on fertility and periods, while the metabolic side of the condition - the part driving fatigue, cravings, mood swings and long-term health risk which went largely unaddressed.

That's starting to change. Muscle and protein aren't just "healthy lifestyle" advice handed out to everyone, for women with PCOS/PMOS, they're a direct route to the actual mechanism behind the condition. That's a meaningfully different, more useful starting point than being told to just eat less and move more.

A note on what metabolic health actually is: it refers to the body's ability to efficiently convert food into energy while maintaining balanced blood sugar, blood fats, and blood pressure, reducing the risk of chronic diseases.

What does some of the research tell us?

A 2024 review represents a high-level synthesis of the topic, consolidating decades of research to argue that PCOS (now more appropriately PMOS) should be primarily understood through a "metabolic" lens.

The review highlights insulin resistance, chronic inflammation, and altered energy metabolism as key features that can persist across the lifespan in women with PMOS. This reinforces the need for sustainable lifestyle management rather than short-term intervention, meaning small changes that drive consistency and habits that stick are the best route forward. Importantly, the metabolic focus of PMOS helps connect the findings of the other studies, showing why muscle and nutrition are central to management.

Study 2: Skeletal Muscle as a Primary Site of Dysfunction The metabolic action within PMOS was understood (frustratingly) quite a while back with a 2013 study highlighting that targeting skeletal muscle directly through resistance training and nutrition improves insulin sensitivity and metabolic health within PCOS/PMOS.

Study 3: PCOS and Musculoskeletal Health in Midlife Similarly, this recent 2025 longitudinal study reinforces the importance of maintaining muscle mass and function throughout the lifespan of all women, but especially those with PMOS.

Study 4: Nutrition as a Central Intervention In 2023, a comprehensive review demonstrated that nutrition is fundamental to PMOS management, influencing insulin sensitivity, hormonal regulation, inflammation, and body composition. Protein supports lean mass, while higher-quality carbohydrates, fibre, healthy fats, and adequate micronutrients support metabolic health. Together with resistance training, nutrition provides a key strategy for improving metabolic function and maintaining muscle long term.

So, what does this actually mean in the real world?

It starts with insulin.

At the root of PMOS is insulin resistance. Your cells stop responding properly to insulin, so your body makes more of it and that extra insulin raises testosterone in your blood, which is what drives fatigue, cravings, acne, excess hair growth and irregular cycles.

Muscle is the body's single biggest user of blood sugar. The more of it you have, the more capacity your body has to manage that whole chain reaction. Muscle is the body's largest site of glucose disposal, which is exactly why building it matters here.

"This isn't about aesthetics. It's a direct, physiological intervention women can start applying today." - Nat, in-house Registered Nutritionist

How does strength training fit into PMOS management?

Not on its own, and not overnight and we'd rather tell you that upfront. Recent research comparing exercise types found resistance training alone was the slowest to move the needle on insulin resistance, behind yoga, HIIT and regular cardio.¹

That's not a reason to skip it, it's a reason to pair it. The trials that showed this only ran a matter of weeks, nowhere near enough time to build meaningful muscle. Combine resistance training with some cardio for now, and think longer term. Muscle is a long-term investment, not a 12-week fix.

How much protein do women with PMOS need?

Studies on higher-protein diets in PCOS found real improvements in insulin levels compared to standard balanced eating - though the benefit was clearer in shorter studies, so it's promising rather than fully settled.²

Aim for protein at roughly 25%+ of your daily energy, about 1–1.6g per kg of bodyweight. Spread it across 3–4 meals of 20–30g each rather than saving it all for dinner. Your body can only use so much protein at once to actually build muscle, little and often works harder than one big hit.³

Is more protein always better? Not quite. Very high, sustained protein intake, especially from animal sources, can nudge blood sugar in the wrong direction, even while other markers improve.⁴ The amounts shown to help with PMOS specifically (around 25% of your daily energy) sit well below that tipping point. More isn't always better, moderate-high beats maximal.

Do you need protein powder if you have PMOS?

Not necessarily, whole food sources of protein (eggs, poultry, fish, tofu, Greek yoghurt, lentils) can absolutely get you to your daily target. But protein powder can be a genuinely useful, convenient tool, particularly around specific windows.

A small study gave women with PCOS a whey protein shake before a meal and found it helped keep blood sugar steadier than going without, a fast-digesting protein doing something a slower whole-food source might not do as quickly.⁵

A protein shake with or before a meal may help smooth your glucose response, on top of making it easier to hit your daily target. Early days, but a genuinely interesting angle.

When protein powder tends to be the more convenient option:

• Breakfast, if you're rushing out the door and would otherwise skip protein altogether
• Before a meal out, if you know portion sizes or protein content will be hard to control
• Post-workout, when you need a fast, easy 20–25g hit without cooking
• Topping up a lighter meal (a salad or soup) that's fallen short of your 20–30g target

Why muscle and protein work as a pair

Training gives your muscle a reason to grow. Protein gives it what it needs to actually do that. Skip either one and the other underperforms, especially if you're eating less to manage your weight, which is exactly when muscle is most at risk.

Women with PMOS tend to start with less muscle than women without it, even at the same weight.² There's more ground to make up, worth making up now.

"Metabolic health and reproductive health were never separate systems. Muscle is one of the most direct ways women can act on that, starting today." - Nat, in-house Registered Nutritionist

What does this look like in everyday life?

The habits below are simple on paper. Here's what they actually look like on a plate.

A realistic day of protein-forward meals:

• Breakfast: Greek yoghurt (170g) with berries and a tablespoon of mixed seeds or, on a rushed morning, a protein shake with a banana. Roughly 20–25g protein either way.
• Lunch: A grain bowl with grilled chicken or tofu (120–150g), lentils, roasted vegetables and a tahini dressing. Roughly 30–35g protein.
• Snack: A handful of almonds with an apple, or two boiled eggs. Roughly 12–15g protein.
• Dinner: Baked salmon (150g) with quinoa and greens, or a bean and vegetable chilli with a side of cottage cheese. Roughly 30g protein.

That pattern lands close to the 20–30g-per-meal target across the day, without needing every meal to be a protein shake or a plain chicken breast.

Habits to build on:

• Train and move. Resistance training paired with some cardio, consistently.
• Protein at every meal. Roughly 20–30g, 3–4 times a day. (See the meal examples above for what that looks like in practice.)
• Aim for ~25%+ of your energy from protein, about 1–1.6g/kg bodyweight.
• Keep a protein shake on hand for rushed mornings, pre-workout convenience, or topping up a lighter meal.
• Protect your sleep and stress levels. Both feed straight back into insulin resistance.
• Give it months, not weeks. This is a long game, not a quick fix.

PCOS was never wrong about your body - it just had the wrong name, and for a long time, the wrong focus. Muscle and protein won't undo PMOS overnight. But building and fuelling muscle properly is one of the most direct, evidence-backed things you can do to work with your metabolism, starting today.

This article is for educational purposes and does not constitute medical advice. If you have concerns about PCOS, PMOS or any aspect of your hormonal or metabolic health, please consult a qualified healthcare professional or Registered Nutritionist.

Want to learn more?

• PCOS and Endometriosis: Women's Health Conditions That Are Still Dismissed
• A Nutritional Therapist's Guide to Managing Your PCOS Symptoms
• Muscle and Longevity: What New Research Reveals About Strength
  
  

References

1. Tan Y, Liu Y, Koga A, Yuan Y, Yu H, Liu J. The Effects of Different Exercises on Insulin Resistance and Testosterone Changes in Women with Polycystic Ovarian Syndrome: A Network Meta-Analysis Study. Healthcare (Basel). 2025;13(17):2132. https://doi.org/10.3390/healthcare13172132
2. Wang F, Dou P, Wei W, Liu PJ. Effects of high-protein diets on the cardiometabolic factors and reproductive hormones of women with polycystic ovary syndrome: a systematic review and meta-analysis. Nutrition & Diabetes. 2024;14:6. https://doi.org/10.1038/s41387-024-00263-9 (Lean mass finding cited within: Barrea L, et al. Nutrients. 2019;11:2278.)
3. Layman DK. Impacts of protein quantity and distribution on body composition. Frontiers in Nutrition. 2024;11:1388986. https://doi.org/10.3389/fnut.2024.1388986
4. Nagy S, Turner LV, Riddell MC. Effects of protein intake on glucagon, insulin, and glucose dynamics: implications for diabetes. Frontiers in Clinical Diabetes and Healthcare. 2026;6:1712506. https://doi.org/10.3389/fcdhc.2025.1712506
5. Zumbro EL, Rao M, Balcom-Luker S, Broughton KS, LeMieux MJ. Whey Protein Supplementation Improves the Glycemic Response and May Reduce Non-Alcoholic Fatty Liver Disease Related Biomarkers in Women with Polycystic Ovary Syndrome (PCOS). Nutrients. 2021;13(7):2451. https://doi.org/10.3390/nu13072451