Eating different types of food at certain times i.e. after a hard training session, can have effects on energy levels and performance. Eating a plate of pasta (or complex carb source) after a workout is a great way to put yourself to sleep for example.
All food is the same really, just different ratios of what they contain, good or bad
Learn something new everyday. I will try the carb source thing oneday soon and see if it helps me go to bed quicker after a night workout thanks.