Fueling a cool marathon as a heavy, salty sweater
Cool weather does not switch off a high sweat rate. If your kit is white with salt after a long run, sodium still belongs in the plan.
The three-product answer
NEVERSECOND C30 Fuel Drink Mix
- Caffeine-free: good for the early miles, before you take caffeine.
- 200 mg sodium: a good match for a high sweat rate.
Precision Fuel & Hydration Carb & Electrolyte Drink Mix (PF 30/60)
- Caffeine-free: good for the early miles, before you take caffeine.
- 500 mg sodium: a good match for a high sweat rate.
Maurten Drink Mix 160
- Caffeine-free: good for the early miles, before you take caffeine.
- 210 mg sodium: a good match for a high sweat rate.
Electrolyte pairing for this profile: GU Energy Hydration Drink Tabs or Nuun Sport Tablets. Sodium's job is keeping you drinking, not preventing cramp.
Why
A salty sweater loses more sodium per litre than average, and on a cool day the reminder to drink is weaker, so intake drifts low. The carb target stays in the normal 60–75 g/hr band; the sodium question is the one to get right.
What matters: sodium in what you drink, at a concentration that keeps you drinking, or a salt capsule with water at fixed intervals if your fuel is low-sodium gels. Sodium does not prevent cramp — that claim does not survive the studies — but it keeps fluid intake up.
The trap is over-drinking plain water on a cool day because you feel fine. Drink to thirst, fuel to schedule.
Also fits
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