"Eat meat and vegetables, nuts and seeds, some fruit, little starch and no sugar. Keep intake to levels that will support exercise but not body fat." - Coach Greg Glassman, CrossFit Founder and CEO
This is not groundbreaking. It makes sense and supports our performance in and out of the gym. A clean diet supports proper immune function, acts as an anti-inflammatory to the digestive system, and promotes overall health and function to our bodies both internally and externally, including organs, skeletal and muscular growth.
Within CrossFit there are two popular approaches to eating; Paleo & Zone.
~Paleo. Eat food that our paleolithic ancestors ate and avoid foods that are processed (including grains, legumes, potatoes).
Buy the food from the perimeter of the grocery store & avoid the processed food in the middle that doesn't spoil.
~Zone. Reduces insulin spikes to improve performance by balancing macronutrients (30% protein, 40% carbs and 30% fats). Requires that you weigh and measure your food but you can 'eyeball it' after a while.
Do something that works for you and start easy by simply cutting the crap (chips, pop, candy, SUGAR) from your diet. Still enjoy your cheat meals (1 a week) as they keep you committed and give you a treat. For food quality, use Paleo as a guide to stay away from processed foods. For quantity, use Zone to make sure you eat more protein: your body needs it.
Food is our fuel for metabolism. What is metabolism? Does metabolic pathway ring a bell for all of you who payed attention during your Foundations class? Metabolism is all the chemical processes that go on necessary to maintain life, also to produce energy. You need energy to do stuff like walk to your car, climb stairs, pick things up, run, jump, lift, pull, push....you get the point.
When it comes to your nutrition and making choices about what to eat and what not to eat, it comes down to two questions: Where are you compared to where you want to be? What are you training for?
Protein is pretty easy to understand, but fat can be tricky. There are three different types of fat: saturated, monounsaturated and polyunsaturated. Saturated fat is the most stable and the best for your body. The problem is that when you eat a food that has fat in it, it's in a combination of all three. DAMN IT! So what do you do?
Instead of trying to know or remember exactly which meat has which kind of fatty-acid balance, just rotate your meat sources. Eat grass fed beef, chicken, seafood, eggs, and that will give you a nice balance across the three different types.
Carbohydrates are used for energy. You don't need to take in carbohydrates and can do without them. But for our style of training, you're going to want to have some carbohydrates in your diet to be effective. You can obtain your carbohydrates from vegetables, nuts and seeds, and fruit and starch. Everybody responds differently to carbohydrates. You have to test and adjust what works best for you.
My first recommendation is to stop eating sugar. Sugar kills.
Why eliminate sugar? Take a look at chronic diseases (obesity, heart disease, cancer, type 2 diabetes) in relation to 1st world countries. What you will see is a direct relationship between sugar consumption and chronic disease. When it comes to nutrition there is not one plan to fix all. Most are templates to help get you started in the right direction. There is a lot of bullshit out there as well....just watch Good Morning America for a week. You have to do your research a little bit further than whatever source of media out there that spews useless vomit about the "lose 30 pounds in a month" plan.
In our monthly nutrition class we keep it down to 3 things.
Super Basic, Impossible to Screw Up. & Don't Be Weird.
Super Basic...
Eat this: meat fish, seafood, fowl, eggs, vegetables, roots, tubers, bulbs, herbs, spices, animal fats and dairy.
Limit this: nuts, seeds, fruit.
Avoid this: cereal grains, soy, legumes, vegetable seed oils and sugar.
Impossible to Screw Up...
Gain weight: 20+ calories per pound of body weight
Maintain weight: approx. 17 calories per pound of body weight.
Lose weight: eat less than 15 calories per pound of body weight.
These are guidelines, not gospel. If you are replacing meals with bars or shakes, find the person sitting closest to you and have them punch you in the throat. Meal replacement is bullshit. Eat real food (see above). If you are a macro counter and are on the "if it fits my macros" plan, you're ignorant. All calories are not created equal. If that were the case then I'd trade the lean beef and veggies in for Reese's peanut butter cups and cheese cakes.
Don't Be Weird...
If you are just now embarking on a new way to eat and have decided to no longer be on America's supersonic train to chronic disease and diabetes-ville then just keep it simple and don't be weird. Eat when you are hungry, but eat quality, nutrient dense foods. Don't get overwhelmed with how much to eat or what time to eat and all the other details. This is too complex and overwhelming for starters and is a sure way to fall off fast. Do you own a vehicle? If so, when is the last time you put fuel in it? Did you visit a local cattle farmer and ask them if you could collect cow shit to put in your vehicle for fuel? Hopefully not. If you take care of your car engine and run quality fuel in it then why are you not doing the same for your body. It is a far more complex machine. Allow yourself some flex room. Enjoy a cheat meal at least once a week in the beginning. This gives you a short term goal to work towards every 7 days. Drink a beer, have a glass of wine, eat some cake, etc....whatever your weakness is. Enjoy it, but don't make it an every other day habit. Don't be weird.
The data is obvious. We don't have to wait another 10 years to figure out that we are eating poorly and not getting enough physical activity. The dam has already burst. If your trainer/coach isn't talking nutrition with you they are doing you a disservice, fire them.