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Summary
On episode 486 of 40+ Fitness, Coach Allan and running coach Rachel Everett open a two-part series on nutrition for runners, covering hydration guidelines, electrolytes, and why fueling strategy differs sharply between a sugar-burning runner and a keto-adapted one.
They argue that most runners who struggle at longer distances have a hydration problem, not a nutrition problem, and that both dehydration and overhydration (hyponatremia) can be genuinely dangerous.
The episode lays out the RRCA's fluid guidelines and stresses that every runner needs to test and journal their own hydration and nutrition strategy in training, long before race day, because the right numbers are different for everyone.
Links
- https://40plusfitness.com
Key Takeaways
- Keep a nutrition and hydration journal. Track daily eating and drinking, then note how you feel on training runs, to find the actual patterns that help or hurt your performance rather than guessing.
- Train your race-day fueling strategy, don't improvise it. What and when you eat and drink during a run is different from normal eating, so it has to be rehearsed in training, not decided the week of the race.
- Most runners fail on hydration, not nutrition. A fluid loss of just 1 percent measurably hurts circulatory performance, and 2 percent makes it worse, but exact hydration needs vary a great deal from person to person.
- Overhydration (hyponatremia) can be just as dangerous as dehydration. Allan shares his own emergency-room experience with severe low sodium after drinking large amounts of plain water on a low-salt diet, which nearly proved fatal.
- Electrolytes matter as much as water. Sodium, potassium, magnesium, and calcium regulate fluid balance, blood pressure, and muscle contraction, and heavy sweating strips them out quickly, especially for “salty sweaters.”
- Weigh yourself before and after a long run to estimate fluid loss. The difference in ounces gives a rough, practical guide for how much fluid or electrolyte drink to replace afterward.
- The RRCA's fluid guidelines are a starting point, not a fixed rule. Roughly 10 to 16 ounces one to two hours before a run and 4 to 8 ounces every 15 to 20 minutes during it, but actual needs shift with weather, sweat rate, and the individual.
- Sugar-heavy drinks like race-day Gatorade can cause a “sugar bomb.” Alternating water with electrolyte drinks in training helps avoid stomach distress and mouth irritation that build up late in a race.
- Fueling strategy diverges sharply between sugar burners and keto athletes. Glycogen-dependent runners typically bonk after roughly 90 minutes to two hours without carbs, which sets up the sugar-burner versus keto split covered in part two.
“Being dehydrated on a run or being over hydrated on a run can both be extremely dangerous.”
Coach Allan Misner
