These rules apply to people who have already switched over to the Paleo diet. Here is a checklist to go through while dialing in your nutrition:

1.Get rid of all the sneak in’s, such as: Dairy, wheat, rye, barley, quinoa, rice, corn, sugar, oats, etc. Basically, get rid of all the processed junk! This should have already been done!
2.No alcohol
3.Cut out all dried fruit
4.Reduce your fruit intake
5.Keep an eye on your portion sizes
6.Eat more Vegetables
7.Up your protein intake- 0.8-1 gram of protein per pound of body weight
8.Minimize nut intake- it is easy to overdo
9.Drink more water
10.SLEEP!!!
11.Take your fish oil- Robb Wolf Fish Oil Calculator

Source: Crossfit Maximus