[sirdarksol]

One of the things that I have most found to impact how I feel on a day to day basis is that I have started trying to eat more and more natural foods. I am not necessarily talking about organic stuff (though I'm trying to do this, as well), but just eating food that hasn't been hugely processed. I have been trying to make more homemade foods, rather than pre-packaged stuff, since most of the latter has some sort of preservatives, processed food, etc...

The biggest difficulty with doing this is that it takes time. There are ways to maximize your time (like make a large batch of something and refrigerate/freeze it in single servings), but you still have to spend time doing so.

The second biggest difficulty is cost. For the first time in history, it is cheaper to buy high-sugar, high-fat, pre-made foods. This is because processing allows corners to be cut, lowering costs.
One way to lower costs is to find a local farmer's market. Since you are buying produce/meat directly from the farmers, the cost is lower.

On mornings that I make myself a meal at home, I have far more energy during practice than I do on the days that I have a gas-station or fast-food breakfast. Not a scientific study, but good enough indication for me to keep doing it.