This article is from the Aerobics Fitness FAQ, by oaktree@shell.urjet.net (Robles) with numerous contributions by others.
If you feel like eating immediately after a workout, be
sure that it's high in carbohydrates, lower in protein, and
either very low or no fat content. The carbs should be
mostly complex. Durum or semolina pasta, fat-free granola
bars, and some of the lower-sugar fig or other fruit bars are fine.
Try to take in as few kCals as you can - just take the "edge" off.
Munching out on broccoli or cauliflower florets with just a touch
of fat-free Ranch is good.
If the workout was pretty intense, I'd recommend about an
hour's wait afterward before eating a full meal. Most
people aren't really ready to eat when they're majorly
sweaty and still breathing heavily, anyhow. Cool down, then grab a
nice refreshing shower, and mellow out with a big glass of ice water.
Next, find some candles, and sit down to a nice plate of rigatoni
with tomato sauce with basil, green peppers, and little bits of
chopped mushroom. Brush your whole wheat toast with a film of
olive oil, sprinkle on some freshly-chopped garlic, ...you get the
picture.
 
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