Protein For Women in Midlife

Written By Lisa Bush

Protect Your Muscle. Support Your Metabolism. Age Strong.

Why Protein Matters More After 40

As women enter midlife, our bodies naturally experience:

  • Loss of muscle mass (sarcopenia)

  • Slower metabolism

  • Increased insulin resistance

At the same time, our bodies become less responsive to protein—this is called anabolic resistance. This means you need more protein—and higher quality protein—to maintain muscle and metabolic health. The USDA recommendations for protein are merely the protein you need to survive, NOT the amount that you need to build muscle. Protein helps us maintain muscle, boost metabolism, and it helps us feel full longer. Did you know that muscle takes up 70-90% of the sugar used in our body?! So having muscle mass and using that muscle can help with insulin resistance and diabetes

How Much Protein Do You Need?

A practical target for most women:

  • 30–40 grams of protein per meal

  • Aim for 3 meals per day

  • Note that this may be different if you have kidney disease

It is the most important that you meet these thresholds on your first and last meals of the day - when you are breaking your fast, and when your body is going into repair mode. This way, your body has the amino acids it needs for building and repair, and does not have to tap into your own muscle stores to get what it needs.

The Leucine Threshold (The “Muscle Trigger”)

Protein alone isn’t enough—you need enough leucine to activate muscle building. This is like a light switch - if you move the switch only half way, the light doesn’t turn on. You must surpass the leucine threshold to activate muscle protein synthesis

👉 Target: ~2.5–3 grams leucine per meal

This typically comes from:

  • 25–30g whey protein

  • 30–40g animal protein

  • Higher amounts of plant protein (there is some discrepancy as to how much plant protein actually gets absorbed 50-75% is the generally accepted answer). This decreased absorption is due to the fiber in plant proteins.

Not All Protein Is Equal

🥛 Animal Protein (Best for Efficiency)

  • Complete protein

  • High in leucine

  • Examples: eggs, chicken, fish, Greek yogurt, whey

🌱 Plant Protein (Can Be Complete if Combined)

Single plant sources are often incomplete.

Look for blends like:

  • Pea + rice protein

  • Soy (complete on its own and generally 90% absorption)

  • Again, you may need larger servings to get the same effect.

Whey vs Whey Isolate

  • Whey concentrate: more lactose, slightly less protein

  • Whey isolate: higher protein, easier to digest (more expensive)

Choosing a Safe Protein Powder

Protein powders are not tightly regulated.

Some products have been found to contain:

  • Lead

  • Cadmium

  • Arsenic

👉 Look for third-party testing:

  • NSF Certified for Sport

  • USP Verified

  • Informed Sport

Generally plant-based proteins have been found to have higher amounts of heavy metals, with chocolate flavors being the worst offenders. Below is a link to an interesting analysis of protein powders. It also highlights brands that stand out for purity.

https://cleanlabelproject.org/protein-study-2-0/

Practical Tips

✔ Eat protein at every meal
✔ Prioritize whole foods first
✔ Use protein powder when needed
✔ Strength train 2–4x/week
✔ Think: “Did I trigger muscle today?”

⚠️ Disclaimer

This information is for educational purposes only and is not intended as medical advice. Please consult your healthcare provider for personalized recommendations.

Lisa Bush https://www.optimalwellnessnw.com