What to eat before and after running: timing, amount and tolerance

Before: give the stomach time

The goal of pre-run food is available energy without a stomach that rebels while running. A meal based on carbohydrate, with moderate fat and fibre, is usually eaten 2–3 hours before training or racing. If time is short, choose a smaller, easy-to-digest carbohydrate such as a banana, bread, rice or a carbohydrate drink. Timing depends on gastric emptying, the food and your tolerance.

Fasted morning runs may be fine for short easy runs but are a poor fit for quality sessions, long runs or races. Before trying fasted training, make sure you do not become dizzy or weak, and have fuel available. People with diabetes or medication that affects blood glucose should consult a clinician first.

After: total intake matters more than a “window”

Post-run carbohydrate helps restore glycogen and protein supports repair; eating both is usually more complete than a sugary drink alone. The ISSN nutrient-timing position stand stresses that timing should fit the exercise demand, the individual and the overall diet, not a fixed number of minutes. A normal meal within a few hours is often more practical than precise timing.

If another session or race follows soon, earlier carbohydrate and protein has more value. After an easy run, total daily energy and protein distribution matter more. Replace fluid according to thirst, urine colour and sweat losses; do not force a large volume at once.

Protein and everyday eating

Protein needs depend on body weight, training, age and energy intake; spreading it across meals is easier to implement than concentrating it at dinner. Prefer ordinary foods: grains, legumes, dairy, eggs, fish, meat and nuts. Protein powder is a convenience, not a requirement.

Recovery food does not need to be expensive. Chocolate milk, yoghurt with fruit, rice with eggs or a sandwich with tofu can all work; the point is carbohydrate, protein and fluid together, in a form you will keep eating.

Gut problems

Bloating, nausea or diarrhoea before or after running can come from too much food, too much fat or fibre, dehydration, caffeine or a new product. Record the timing, food and symptoms, and change one variable at a time. Do not try a high-fibre meal, strong coffee or a new supplement for the first time before a race. Seek medical advice for persistent symptoms, blood in the stool, weight loss or interference with daily life.

Scope and limits

This page does not provide an individual nutrition prescription, calorie target or therapeutic diet. People with diabetes, gastrointestinal disease, pregnancy, breastfeeding, a history of disordered eating or medication should discuss pre- and post-run food with a doctor or registered dietitian.

Sources and scope

Pre- and post-exercise timing and individualisation follow the ISSN nutrient-timing position stand; carbohydrate during prolonged exercise follows the ISSN carbohydrate-timing paper; hydration and urine colour follow the NHS hydration page. This is general sports-nutrition education, not clinical assessment. Checked 2026-10-28.