Fuelling Through the Night: What Ultrarunners Know About Eating in the Dark

There is a particular cruelty to the 2 a.m. aid station. You are somewhere between exhausted and hallucinating, your appetite has vanished, your stomach is making decisions your brain did not authorise, and you still have forty kilometres to go. What you eat, or fail to eat, in the hours between midnight and dawn can determine whether you finish or fold. Ultrarunners who race through the night develop a nutritional intelligence that goes far beyond calorie counting.

The core challenge is that prolonged exercise suppresses appetite through hormonal mechanisms, even as caloric demand remains high. The body redirects blood flow away from the gut, slowing gastric emptying and making digestion less efficient. Meanwhile, the psychological demands of night running, navigating by headlamp, fighting sleep deprivation, managing emotions, add an invisible caloric tax that most race nutrition plans don't account for.

What Actually Goes Down at 3 a.m.

Experienced ultrarunners often report a decisive shift away from sweet gels and toward savoury, solid food during night sections. Broths, boiled potatoes with salt, rice balls, and cheese are aid station staples at well-run 100-milers for good reason. Salt cravings intensify with prolonged sweat loss, and the textural variety of real food can break through appetite suppression in a way that another gel simply cannot.

Small, frequent intakes become more important than ever. Rather than waiting for hunger signals that may never come, experienced athletes set timers, eating a small amount every 20 to 30 minutes regardless of how they feel, treating food as maintenance rather than reward.

The Gut Is Trainable

Perhaps the most useful insight from ultrarunning nutrition is that the gut, like the legs, responds to training. Practising eating during long runs, not just short workouts, but genuine long efforts where the body is under accumulating fatigue, teaches the digestive system to function under duress. Athletes who never eat during training often suffer catastrophically in races.

If you are preparing for any event lasting more than three hours, build your nutrition strategy into your long training days from the start. Experiment with textures, timings, and foods. Your night-time self will thank your afternoon-training self in ways that are genuinely difficult to overstate.