Why “Eat More Carbs” Hits Differently After 45
I was recently talking with my 22-year-old nephew about training and food. At one point he asked, perfectly reasonably:
"If I'm trying to build muscle, do I need carbs — and how much?"
For him, the answer is simple. For women in midlife almost nothing about nutrition is simple, and carbohydrates are no exception.
This gap — between who most nutrition advice is written for and who is actually trying to follow it — is where a lot of well-intentioned guidance quietly falls apart.
His Body vs Yours
At 22, my nephew's body is biologically set up for growth. High testosterone, strong insulin sensitivity, substantial lean muscle mass. When he eats carbohydrates, they go straight to his active muscle tissue, which is hungry, responsive, and entirely clear on what to do with incoming fuel. A bowl of cereal before training is not a complicated proposition for his metabolism. It's just logistics.
For women in perimenopause and beyond, that clarity tends to evaporate. Not because anything has gone wrong — but because the metabolic context has fundamentally shifted. Declining estrogen reduces insulin sensitivity, so muscle cells become less responsive to glucose. Glucose stays in circulation longer. The body gets better at storing excess energy centrally — which is a polite way of saying: around the middle, where you didn't ask for it.
Cortisol adds to this. Poorly managed stress compounds blood sugar dysregulation, which is why energy highs and lows in midlife often feel sharper and less predictable than they used to.
None of this is malfunction. It's normal female physiology. It does mean the advice your nephew can follow without thinking twice will produce a different outcome in your body — and pretending otherwise is how women end up confused and blaming themselves for something that was never their fault to begin with.
Carbs Are Not the Main Character Here
The primary goal in midlife nutrition is muscle preservation. And here's what tends to surprise people: carbohydrates are not the driver of that. Protein is. Resistance training is. Carbohydrates, in this context, are a supporting player — useful, but not the point.
Without consistent muscle activation, excess carbohydrates don't have anywhere productive to go. They're not bad. They're just unemployed. And unemployed energy in a midlife body has a reliable tendency to find its own storage solution.
Stable blood sugar matters more at this stage than training fuel. Carbohydrates work best when they're paired with sufficient protein, included as part of a complete meal, and not doing the job alone.
The Order of Operations
In a younger body, carbohydrates can help build muscle. In a midlife body, the relationship runs the other way — you use muscle to direct what happens to carbohydrates.
Muscle contraction increases glucose uptake independently of insulin. Active muscle creates its own demand. When you train consistently — and two to three resistance sessions a week is genuinely enough — you create a metabolically active destination for fuel. Without that signal, carbohydrates circle the system looking for work and default to storage.
This is why movement in midlife isn't primarily about burning calories. It's about keeping the machinery online.
What This Looks Like in Practice
Fibre slows glucose entry. A carbohydrate eaten without protein, fat, or fibre hits the bloodstream fast and demands an insulin response that a midlife body handles less smoothly than it once did. Pairing carbohydrates with fibre-rich vegetables or choosing inherently high-fibre sources buffers that entry and keeps energy stable.
Protein comes first. The 30–40g per meal threshold covered in the earlier post isn't just about muscle — it anchors the meal and gives carbohydrates something to work alongside rather than dominate.
Three adjustments that actually move the needle:
Resistance training first. Two to three sessions a week is enough to tell your body to prioritise muscle repair. It creates a destination for fuel — without it, carbohydrates have nowhere productive to go.
Protein anchors the meal. The 30–40g per meal threshold gives carbohydrates something to work alongside rather than dominate.
Fibre buffers the entry. A carbohydrate eaten without protein, fat, or fibre hits the bloodstream fast. Pairing carbs with high-fibre vegetables, or choosing inherently fibre-rich sources, slows that entry and keeps energy stable.
The Takeaway
Same macronutrient. Different life stage. Different rules.
The question was never "do I need carbs?" It's "what is my body actually trying to do with them right now?"
For my nephew, carbohydrates are fuel for growth. For women in midlife, they're a supporting cast member in a production where protein and resistance training have the lead roles.
Get those right, and carbohydrates stop being something to worry about.
References
1. Dionne, I. J., et al. (2003) Effect of menopause on insulin sensitivity and glucose metabolism. Diabetes Care, 26(10), 2879–2885
2. Rettberg, J. R., et al. (2014) Estrogen, insulin signaling, and glucose metabolism in aging females, Frontiers in Neuroendocrinology, 35(4), 515–528
3. Holloszy, J. O. (2005). Exercise-induced increase in muscle insulin sensitivity. Journal of Applied Physiology, 99(1), 338–343
4. Morton, R. W., et al. (2018). Protein intake to maximize resistance-training adaptations. British Journal of Sports Medicine, 52(6), 376–384
5. Vargas-Molina, S., et al. (2022), Carbohydrate intake and resistance training performance: a systematic review, Nutrients, 14(4), 856.
6. Phillips, S. M., & Winett, R. A. (2010), Resistance training and health-related outcomes across the lifespan. Sports Medicine, 40(1), 1–24.
This article is for educational purposes only and does not constitute medical advice. Individual needs vary. Please consult a qualified health professional for personalised guidance.
