How and what do I eat 3 weeks before my first marathon?

An endurance event, such as a marathon, requires an athlete to expend energy throughout hours of physical activity. to maximize energy for the competition days before the event, try "Carbohydrate loading"...this is part of race preparation for many endurance athletes. Following such a regimen boosts muscle glycogen, the fuel that powers your muscles, by 20 - 40 percent above normal levels.

Here's the gist of Carb loading-- Begin to taper down your workouts a week before your competition. During the first three days of tapering, your daily food intake needs to provide your weight maintenance calorie needs with 50 percent of calories coming from carbohydrates. Analysis of your calorie needs and meal plan can be done with th

Nutrient Analysis Tool.