In the early days of the marathon, runners took in nothing but water. Today, they benefit from research into easily digestible energy sources that help fuel them for the long run.
When it comes to eating before a marathon, be sure to stick with a high-carbohydrate diet. This includes breads, pasta, cereals, and fruits and vegetables.
When it comes to preventing cramps in marathons, you first need to understand and know the cause. Some runners get cramps if they’ve eaten too close to running. Also, running harder or faster than you’re accustomed to, in hot weather, can cause cramping.
If you are in reasonably good health, preferably over age 18, and have the necessary time and energy, you can run a marathon.