I am preparing for marathon and I feel the need to change my diet to prepare better for this event. What is your experience? Which changes did in your diet helped you most? What was hardest to give up?
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What does your current diet look like? What is your current marathon PR and what is leading you to think your diet may not have been quite right? You'll need to provide some insight into what you're currently eating before you can get any specific advice on what to change.
There are many resources on the web that offer suggested plans and they all generally fall into similar recommendations.
Marathon training burns a lot of carbs, how much you burn will differ based on your fitness level, experience, pace, and running economy. The general wisdom is that runners should be consuming a diet that is composed of between 65% and 70% carbohydrates. A typical marathon training diet is one that is around 65% carbohydrates,25% protein, and 10% fat.
Here are several links to articles that will say roughly the same thing and give varying approaches to building your diet plan. You'll need to figure out what works best for your body through trial and error.