All dairy products: milk, cheese, yoghurt, contain tryptophan, and they also contain calcium. It turns out the calcium doesn’t just build strong bones, it also relieves stress and stabalizes muscle fibres – even those in the brain.

How To: Manage Your Hydration Levels on the Bike

We reckon the perfect option would be a good hot chocolate – it turns out our mums were right all along, but milky oatmeal, or cheese and crackers are other popular suggestions.