We have a somewhat contrarian view of proper nutrition.
First, we find the goal of proper nutrition can and is used as an excuse not to train hard. There are many people with great diets who are severely deconditioned. Likewise, there are many people who have terrible diets, but are very fit.
We do believe that a bad diet will limit and hinder your fitness. Eat well, train hard, get plenty of sleep, and you'll make great gains.
Second, proper nutrition is intuitive, it isn't rocket science. You know when you're eating junk.
Third, we believe strict, onerous diets are not sustainable over the long run. And we're in it for the long run.
Finally, "event" nutrition is different from daily nutrition. If you have a long run, big climb, or tactical mission ahead, carbo load or you'll likely bonk.
Here's our Nutritional Guideline:
6 Days a week eat as much as you want of:
-Venison / Elk
-Dairy (cheese - real cheese - in limited amounts is ok)
Do not eat:
1 Day a week: Cheat your ass off. Pizza, beer, ice cream - you name it.
If you are eating whole natural foods then you are getting everything you need to reach a elite level of fitness.
The only supplement we recommend is a whey protein shake. They are inexpensive and a very convenient source of nutrition. Take one right after training if you do not plan on eating after.