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You've spent days, weeks, or even months prepping for your first 10K or big meeting with corporate. So don't blow it on game day by showing up feeling sluggish or stressed. "If you know what to eat before an event you can rev your body and your brain for peak performance," says Elizabeth Somer, R.D., a SHAPE advisory board member and the author of Eat Your Way to Happiness. Here's everything you need to power up for success in any situation.