This post is written in partnership with Cell Squared. I only recommend products I use personally and trust clinically. This post contains an affiliate link — if you purchase through it, I may earn a small commission at no extra cost to you.
Something shifts in perimenopause that most women — and many practitioners — don’t fully appreciate when it comes to protein.
It’s not just that you might need more. It’s that your body becomes less efficient at using what you eat. That’s a meaningful distinction, and it changes how I think about protein with every perimenopausal woman I work with.
What Changes in Perimenopause
As oestrogen declines, so does something called anabolic signalling — your body’s ability to build and maintain muscle from dietary protein. This is sometimes called anabolic resistance, and it means that the same amount of protein that maintained your muscle mass in your 30s may no longer be enough in your 40s and beyond.
Add to that the fact that muscle mass naturally declines with age (sarcopenia), and that muscle is your primary site of glucose uptake and metabolic regulation, and you start to understand why getting protein right in perimenopause matters so much more than it did before.
How Much Protein Do You Actually Need?
The research on protein in perimenopause and beyond consistently points to significantly higher intakes than the standard RDI. I’m typically looking at 1.6–2.2g per kilogram of body weight per day for perimenopausal women — more if you’re very active or in a significant hormonal transition.
Equally important is distribution. Because of anabolic resistance, you need a minimum threshold of protein at each meal — around 30g — to effectively stimulate muscle protein synthesis. Spreading protein across three meals is more effective than front- or back-loading it.
Why Protein Quality Matters
Not all protein is created equal. What determines whether a protein source can effectively trigger muscle protein synthesis is largely its leucine content — leucine is the amino acid that acts as a direct signal to your muscle cells to start building.
Animal proteins — eggs, meat, fish, dairy — tend to be leucine-rich and are referred to as “complete” proteins. Plant proteins can be valuable, but most require larger servings or strategic combining to hit the leucine threshold needed to stimulate the same response.
Why I Recommend Cell Squared
I’m particular about supplements. Cell Squared Certified Organic Whey Protein Isolate (WPI) is one of the few I recommend consistently — and here’s why.
It has one ingredient: certified organic whey protein isolate from grass-fed New Zealand cattle. That’s it. No fillers, no flavours, no sweeteners. Just clean, high-quality whey.
Each serving delivers 20g of protein with a naturally high leucine content — exactly what you need to actually trigger muscle protein synthesis, not just add protein calories to your day.
It’s also HASTA certified, which means it’s been independently tested for banned substances.
You can shop Cell Squared WPI here, and use code TNN10 for 10% off your order.
How I Use It
My favourite way is in what I call a Supercharged Protein Bircher — it’s become a staple in my household and genuinely one of the most satisfying breakfasts for supporting hormones and energy through the morning.
Supercharged Protein Bircher
- ½ cup rolled oats
- 1 cup unsweetened almond milk
- 1 serve Cell Squared WPI (approx. 30g)
- 1 tbsp chia seeds
- 1 tbsp ground flaxseed
- 2 tbsp full-fat Greek or coconut yoghurt
- Handful of berries
- 1 tbsp almond butter
- Small handful of walnuts
Combine oats, almond milk, WPI, chia and flaxseed in a jar. Stir well and refrigerate overnight. In the morning, top with yoghurt, berries, almond butter and walnuts. Serves one.
The Bigger Picture
Protein is one of those things that sounds simple until you look at the research — and then you realise how much nuance there is, especially for women navigating perimenopause. It’s not just about hitting a daily number. It’s about quality, distribution, and understanding what your body is actually able to do with what you eat.
Getting protein right won’t fix everything. But in my experience, it’s one of the most foundational shifts perimenopausal women can make — and one that consistently creates real, felt change.
Shop Cell Squared WPI here and use code TNN10 for 10% off.
This post contains an affiliate link. All opinions are my own and based on clinical experience and personal use.