Marathon season is here. Many will run in London.

Read Paula Radcliffe's nutrition tips.

Paula Radcliffe shares her knowledge.

Paula Radcliffe eats porridge with bananas and honey before running. She likes this meal.

Porridge is good before running because it gives energy slowly.

Paula Radcliffe also eats dark chocolate before running. She likes it and it gives her energy.

Dark chocolate helps athletes by giving them energy and oxygen.

Dark chocolate has a special part that helps blood vessels. This helps athletes run better.

Dark chocolate with 70% cocoa is good for mood and energy.

Dark chocolate helps before training by making you feel good.

Dark chocolate also helps after hard training.

Dark chocolate reduces muscle pain and helps you recover after exercise.