Wrong. Think for a moment about what you just said. I suspect you are overlooking the (complicated) process of digestion.
It is not only what you consume (vitamins, minerals, carbohydrates, protein, fat and water) but also when (and how) it is consumed. If you were to eat a a snickers bar 5 minutes before training, it would have a small impact on your training since food is only useful when it is being digested.
This is why a pre-workout meal featuring carbs and protein, with very little fiber and fat is helpful around 2 hours before training. Following that an hour latter having some liquid carbs ( and protein) just before training (and perhaps while training) is helpful.