By Matt Fitzgerald for Active.com
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Every meal is important, but no meal is more important than the one before a race. Choosing the wrong foods, eating too much or too little, or eating at the wrong time can affect your performance and possibly ruin your race, or at least make your performance less than optimal. Eating the right pre-race meal at the right time ensures that all your hard training doesn’t go to waste.
The main purpose of the pre-race meal is to fill your liver with glycogen, especially if it precedes a morning race. Liver glycogen fuels your nervous system while you sleep, and as a result, your liver is roughly 50 percent glycogen-depleted when you wake up in the morning. Your muscles, inactive during the night, remain fully glycogen loaded from the previous day.
What to Eat
At least 80 percent of the calories you consume in your pre-race meal should come from carbohydrates. Keep your protein, and especially your fat and fiber consumption low. These nutrients take up space that are better utilized by carbohydrate. Also avoid gas-producing foods such as onions.
The types of carbohydrate are not important. While some studies have shown a performance benefit associated with eating a low-glycemic index (GI) meal rather than a high-GI meal before exercise, these meals were eaten just 30 minutes before exercise (the worst possible time for a high-GI meal, because blood glucose levels tend to decrease about 30 minutes after a high-GI meal). Recall that in a high-GI meal, carbohydrates enter the bloodstream very quickly, whereas in a low-GI meal, carbs enter the bloodstream at a lower rate.) In studies involving a more sensibly timed pre-exercise meal, the glycemic index of the meal has had no effect on performance.
