Training · guide
Mileage Up, PR Stalled? Audit Your Fueling Before Adding More
When more training stops producing faster races, carbohydrate availability and total energy intake deserve the same scrutiny as the schedule.
When mileage rises and race times do not move, runners usually add another workout. Sometimes the missing stimulus is not training. It is enough energy to complete, recover from, and adapt to the training already on the calendar.
This is not an argument for eating gels during every jog. It is an audit: are the important sessions supplied well enough to produce the quality you planned?
Your weekly mileage is not the full load
A 50-mile (80 km) week can be manageable with good sleep and regular meals. The same week can become a chronic deficit when it sits beside work deadlines, skipped breakfasts, and long runs started with only coffee.
Low energy availability occurs when intake is insufficient for both training and normal physiological function. The 2023 IOC consensus describes health and performance consequences in women and men, while emphasizing that the problem is more complex than body weight alone.
Performance can stall before an obvious crisis. Watch for a cluster: declining workout quality, persistent fatigue, irritability, frequent illness, disrupted menstrual function, low libido, or repeated bone and tendon problems. Those signs justify qualified sports-nutrition or medical support.
Fuel the work that needs quality
For runs under about 60 minutes at easy effort, many runners need no carbohydrate during the session. The priorities are arriving normally fed and eating regular meals afterward.
For demanding or long sessions over 90 minutes, established guidance commonly places carbohydrate during exercise in a broad 30–90 grams per hour range. The correct point in that range depends on duration, intensity, body size, tolerance, and what you have practiced.
Start lower and train the gut. A runner currently taking 20 grams per hour should not jump to 90 on race morning.
Use three windows
Before: Eat a familiar carbohydrate-centered meal 1–4 hours before a long or hard run. The closer the meal, the smaller and simpler it should be.
During: For a 2-hour long run, test 30–60 grams per hour with fluid. For marathon-specific sessions and longer races, trained runners may work toward 60–90 grams per hour using multiple carbohydrate sources.
After: Eat a normal meal containing carbohydrate and protein. If another demanding session arrives within 24 hours, recovery begins sooner rather than “whenever hunger shows up.”
A two-week fueling experiment
Keep the training plan unchanged for two weeks and adjust only the support:
- Eat breakfast before quality morning sessions.
- Carry measured carbohydrate on runs longer than 90 minutes.
- Eat a recovery meal within roughly two hours.
- Record session pace, perceived effort, GI comfort, sleep, and next-day energy.
If quality and recovery improve, you have learned something useful without adding a mile. If nothing changes, examine training monotony, intensity distribution, and target realism next.
The sleep decision guide is a useful companion because fuel cannot compensate for chronic sleep loss.
Three common mistakes
Saving race fueling for race day. The gastrointestinal system needs practice under movement and intensity.
Under-eating on rest days. Adaptation continues after the workout. A rest day is not automatically a dieting day.
Treating body weight as the only signal. Stable weight does not rule out low energy availability, and lighter is not always faster.
More training works only when you can absorb it. Before adding volume, make sure the current work is genuinely funded.