Protein After 40: Why It Matters More As Life Gets Busier
If you've noticed it's harder to hang onto muscle than it used to be, you're not imagining it. But the usual advice — "just eat more protein" — tends to skip the part where you actually have to do that between school runs, back-to-back meetings, and whatever's left of your evening.
So let's do the useful version: why this matters more after 40, how much you actually need, and how to get there without it becoming a second job.
Why protein needs go up, not down, as you age
From your mid-30s onwards, your body becomes less efficient at using the protein you eat to build and maintain muscle — a process researchers call anabolic resistance. Basically, the same plate of food does less than it used to. Add in a naturally busier, more sedentary daily life (more sitting in meetings, less incidental movement than you had at 25), and muscle mass quietly declines unless you're actively working against it.
The people who hold onto strength, mobility and energy into their 50s and 60s aren't the ones with the best genetics. They're the ones who kept training and kept eating enough protein to make the training worth it.
Why busy people under-eat protein (it's not laziness)
Nobody wakes up deciding to skip protein. It happens because:
Breakfast is coffee and whatever's fastest
Lunch is whatever's left in the office kitchen, or skipped entirely
The easiest dinner options (pasta, takeaway, toast because you're knackered) are carb-heavy and protein-light
"Eating well" gets mentally filed under "things I don't have time for"
It's a logistics problem, not a discipline problem. Which means the fix is logistics, not willpower.
What "enough" actually looks like
As a general guide, adults over 40 who are strength training regularly do well aiming for roughly 1.6–2.2g of protein per kg of bodyweight per day, spread across the day rather than loaded into one meal. That's a general starting point, not a prescription — if you're managing a health condition or have specific dietary needs, it's worth checking in with a GP or registered dietitian for numbers tailored to you.
In practical terms, that's usually 3–4 meals or snacks with a palm-sized portion of protein each, rather than one enormous dinner.
A quick story
One of our members — a business owner in his late 40s who trains with us early mornings before the day takes over — came to us mainly for strength and energy, not physique. What actually shifted things for him wasn't a new training split, it was realising he was eating almost all his protein at dinner and barely any before 4pm. A couple of small swaps at breakfast and lunch, no big diet overhaul, and his energy through the afternoon changed noticeably within a few weeks. Small logistics fix, real result.
Three ways to get more protein without overhauling your life
1. Front-load breakfast. Greek yoghurt, eggs, or a protein shake take two minutes and cover a third of your day's target before 8am.
2. Keep one "no-cook" protein option in the house at all times. Tinned fish, cottage cheese, cooked chicken from the supermarket, protein bars for the genuinely chaotic days. The goal is removing decisions, not adding recipes.
3. Batch one thing, not everything. You don't need to meal prep five days of food on a Sunday. Cook a big batch of one protein source (mince, chicken thighs, lentils) and build different meals around it through the week.
FAQ
How much protein do I need after 40? As a general guide, roughly 1.6–2.2g per kg of bodyweight per day works well for adults over 40 who are strength training, spread across 3–4 meals. Individual needs vary, so check with a GP or dietitian if you have specific health considerations.
Does eating more protein actually help with muscle loss? Protein alone won't build or preserve muscle — it needs to be paired with regular resistance training. Together, they're the two biggest levers you have against age-related muscle loss.
Can I get enough protein without supplements or endless meal prep? Yes. Whole food sources (eggs, dairy, meat, fish, legumes) spread across the day get most people there. Shakes and bars are useful backups for busy days, not a requirement.