What to Eat?

The human body needs several nutritients found in food such as Proteins, Carbohydrates and Fats. Some are essential some are not.
An essential nutrient is a nutrient your body NEEDS and CAN'T metabolize ("build"). You MUST bring it with your food.
To be able to do so, you should vary your nutritional intake at each meal.

"Meat and Vegetables, Nuts and Seeds, Some Fruits, Little Starch and NO SUGAR"
- CrossFit -

Proteins: Lean meat and fish should account for about 30% of your total caloric load.
Carbohydrates: Vegetables and Fruits. Low-glycemic and about 40% of your total caloric load.
Fats: Monounsaturated. 30% of your total caloric load.
Calories: Calories measure energy, especially heat energy. One calorie is the energy required to raise the temperature of one gram of water by one degree Celsius. I.e.: The energy intake from Proteins should be between 0.7 and 1.0 grams of Protein per pound of lean body mass depending on physical activity level. The 0.7 figure is for the moderate athlete while the 1.0 figure is for the hardcore athlete .