Ahh, the real fruits of your triathlon labors. You will find that this sport gives you the right to eat virtually anything you want in moderation (those with dietary disorders, maintain your cautiousness). The jury is out as to whether high carb, low fat or a higher fat, lower carb diet is better. But fuel up, since you are burning more calories exercising. I personally maintain high stamina with a steady diet of pancakes, cereal sundaes (grain cereals with fresh fruit and vanilla yogurt), juices and bagels, bagels and more bagels. Yep, I'm a breakfast fanatic! Beef and chicken for protein at least once a week. Salads nightly. Drink at least 10 large glasses of water daily. Experiment with fluid replacement drinks containing valuable electrolytes lost during exercise. A one-a-day vitamin can't hurt. A glass of red wine...sure!