If you're running well into your 40s, 50s, or beyond, the physiology of your training is genuinely different from what it was at 25. Not dramatically, but meaningfully enough that some nutritional habits that worked a decade ago may no longer be pulling their weight.
The good news is that most of what changes is knowable, and the adjustments are practical.
What Actually Changes With Age
The central issue for masters runners is muscle protein synthesis – the process by which your body repairs and builds muscle tissue after training. As you age, the anabolic response to protein becomes blunted. The same meal that adequately stimulates muscle repair in a 28-year-old may not be sufficient in a 48-year-old. [1]
You track your miles.
We'll handle the meals.
This isn't because masters athletes metabolize protein differently in a fundamental sense. Research suggests the basic biochemistry is largely the same. [2] What changes is the threshold – the amount of protein needed to maximally trigger muscle protein synthesis appears to rise with age, particularly in less trained older adults. For sedentary older people, this is well established. For masters athletes who are still training consistently, the degree of impairment is less severe, but the direction of the effect is the same.
Recovery also slows. Muscle damage from a hard session takes longer to resolve. The inflammatory response to training is more sustained. And bone density, which is a legitimate long-term concern for high-mileage runners, requires sustained nutritional support.
None of this means you can't run well, recover well, or adapt to training effectively. It means some nutritional habits are worth revisiting.
Protein: More Per Meal, Not Just More Per Day
The most evidence-supported adjustment for masters runners is increasing protein at each individual meal rather than just aiming for a higher daily total.
For younger endurance athletes, a post-exercise protein dose of around 20 grams effectively stimulates muscle protein synthesis. For older athletes, research on untrained older adults suggests that the threshold shifts to around 40 grams – the muscle simply becomes less responsive to smaller doses. [1] Trained masters athletes likely fall somewhere in between, given that regular exercise attenuates some of the age-related anabolic resistance. The practical guideline from the Gatorade Sports Science Institute: aim for 0.4 to 0.5 grams of protein per kilogram of body weight per meal, with the higher end applying after harder sessions. [2] For a 70kg runner, that's roughly 30 to 35 grams per meal.
Spreading this across four meals throughout the day – rather than concentrating protein at dinner – is more effective for sustaining muscle protein synthesis across the full day. [3]
These meals hit the protein targets with whole food sources that also support recovery:
Salmon Poke Bowl
Pesto Chicken Pasta
Spinach & Egg Breakfast Wrap
Leucine Matters
Not all protein is equally effective at triggering muscle protein synthesis. Leucine – an essential amino acid – acts as a direct signal to initiate the process. Animal proteins tend to be richer in leucine: eggs, dairy, poultry, fish, and red meat. For masters runners who eat mostly plant-based, this is worth attention. Higher doses of plant protein, or combining complementary sources, can compensate – but it requires more intentionality.
Practically: eggs at breakfast, Greek yogurt as a snack, fish or chicken at dinner. Simple, whole-food sources that also happen to be leucine-rich.
Carbohydrates and Calories: Don't Undereat
One nutritional mistake common in masters runners – particularly those who've gained some awareness of weight management – is chronically undereating carbohydrates or total calories relative to their training load.
The consequences compound with age. Undereating elevates cortisol, which accelerates muscle breakdown and interferes with sleep quality. It impairs glycogen replenishment, making training feel harder than it should. And it leaves less nutritional bandwidth for the micronutrients that become increasingly important in later decades.
Your carbohydrate needs don't decrease just because you're older. If you're running similar mileage, your glycogen demands are similar. The pre-run, during-run, and recovery nutrition principles elsewhere on this site apply just as much – arguably more so – for masters runners.
Bone Health: Calcium and Vitamin D
High mileage running is a repetitive impact sport. Over decades of training, bone health requires genuine attention. Two nutrients matter most here.
Calcium supports bone mineral density directly. Dairy foods, fortified plant milks, canned fish with bones, leafy greens, and tofu are all solid dietary sources. The general recommendation for adults over 50 is around 1,200mg per day – higher than the 1,000mg for younger adults.
Vitamin D is necessary for calcium absorption and also plays a role in muscle function. In Canada and other northern latitudes, deficiency is common, particularly in winter months. Fatty fish, egg yolks, and fortified foods provide some, but if you're training hard year-round in a northern climate, it's worth getting your levels checked. Supplementation under medical guidance is often appropriate.
Anti-Inflammatory Foods Earn Their Place
Age amplifies the inflammatory response to training and slows its resolution. The foods consistently linked to reduced inflammation – fatty fish, tart cherries, berries, turmeric, ginger – become more relevant, not less, for masters runners.
This doesn't mean building a supplement protocol around them. It means making them consistent dietary defaults. Salmon twice a week. Tart cherries in a post-run smoothie before big training weeks. Turmeric and ginger in regular cooking. The compounding effect over months and years of consistent intake is more meaningful than any single dose.
Tart Cherry Smoothie
Coconut Curry with Rice
Recovery Windows Tighten
Because muscle protein synthesis is blunted and recovery is slower, the timing of post-run nutrition becomes more important, not less. The window between finishing a hard session and eating a proper recovery meal is worth taking seriously. Liquid calories – a smoothie or chocolate milk – can bridge the gap when appetite is suppressed, but the follow-up meal matters.
Hard sessions need more recovery time too. If you're doing one quality session per week instead of two or three, that's appropriate physiological realism – and the nutritional support around that session deserves more care, not less.
The Bigger Picture
Masters runners who perform well and stay healthy don't have dramatically different nutrition from younger runners. They eat enough, they prioritize protein at each meal, they fuel their runs properly, and they include anti-inflammatory foods consistently.
What changes is the margin for error. Undereating, skipping recovery nutrition, or neglecting bone health matters less at 28. At 48 or 58, the consequences show up sooner and persist longer. The fundamentals are the same – they just need to be followed more consistently.
Fuel.fit tags every recipe by training context – recovery meals are built around the carbohydrate and protein combination that matters most in the hours after a hard session.
Sources
[1] Jeukendrup A. Dietary protein requirements for older athletes. MySportScience. 2017.
[2] Moore DR. Protein requirements of master athletes: do they need more than their younger contemporaries? Sports Sci Exchange. 2021;34(219):1-5.
[3] McKendry J, Currier BS, Lim C, Mcleod JC, Thomas ACQ, Phillips SM. Nutritional supplements to support resistance exercise in countering the sarcopenia of aging. Nutrients. 2021;13(7):2420.
