Carbohydrates
The body's preferred source of energy. Carbohydrates also provide your brain with energy, which is why you will be somewhat "out of it" when you first start a low carb diet. Most bodybuilders will strive to get 2-3 grams of carbs per pound of bodyweight when bulking. (i.e. A 200lb. bodybuilder would strive for 400-600 grams per day). All carbohydrates have roughly 4 calories per gram. In my opinion, it's very important to eat some carbs before training to provide you with energy that you will need.
Too many calories from carbohydrates at one time will be stored as fat. Carbohydrates that are digested fast (called sugars, simple carbs, or simple sugars) will be more likely to be stored as fat because the body doesn't get enough time to burn the calories. Foods that include simple carbs and sugars are fruits, fruit juice, sweets and junkfood containing sugar (including candy, cookies, cakes, soda, etc.) Obviously, you will want to limit the amount of simple carbs that you take in. The only time it is advantageous to take in simple carbs is immediately after training, when your body's glycogen stores are low. Taking in simple sugars at this time will allow your body to
replenish glycogen stores more quickly (in short, this means faster recovery, which translates to quicker growth).
Carbohydrates that are digested by the body more slowly (referred to as complex carbohydrates) are less likely to be stored as fat and tend to be high in dietary fiber. These are the bodybuilder's preferred source of carbohydrates.
These slow burning carbohydrate sources include:
Oatmeal
Whole Grain Bread (nothing with the word "enriched" in the list of ingredients)
Grains
Potatoes, Sweet Potatoes (Yams)
Vegetables - These will be mainly used as a source of fiber, vitamins, and minerals, and not as a source of energy
Pasta
Rice - Brown rice tends to burn slower and because of that, it is a better choice than white rice.
Not all complex carbs burn as slowly as others, for instance whole wheat bread (not enriched) burns much slower than white bread, white rice burns faster than brown rice, also note that pastas burn faster than most other complex carbs.
Faster burning carbohydrate sources include:
Candy
Soda
Cakes, Pies
Sugar of any type
Fruit Juice - Not as good as fruit, but a better choice than the above mentioned foods.
Fruits - Still a very good source of fiber, vitamins, and minerals.
Carbohydrates also affect blood sugar, muscle glycogen levels and insulin production. But for the purpose of keeping this article "beginner friendly", I won't get into all of that. Just remember that when you take in simple carbs (sweets/sugars) your blood sugar spikes relatively fast and then drops that much faster (unless they are taken in after training), which will leave you feeling tired, sleepy, and even a craving for more sugar or carbs. This is another reason why slow burning carbs are preferred.
Fats
Some dietary fats are good for your fitness goals and other dietary fats are very bad for your fitness and your health. Fats, like carbohydrates can either be burnt as energy or stored as bodyfat. Fats generally burn faster than carbs, therefore they are more readily stored as bodyfat. Dietary fats have roughly 9 calories per gram, as opposed to 4 calories per gram for protein and carbs. Along with being used as energy, healthy fats provide a host of other benefits, including maintaining overall health and even making your skin and hair look better. Unhealthy fats (saturated fats) can do just the opposite, especially to your skin.
Sources of "good" or "healthy" fats include but are not limited to:
Fish Oil (basically fats found in fish)
Nuts (good source of protein and healthy fats)
Olive Oil
Flaxseed Oil - can be found in most nutrition stores like GNC
Essential Fatty Acids (EFAs) - also can be found nutrition stores
Sources of "bad fats" include, but are not limited to:
Anything that it deep fried (french fries, fried chicken)
Fat from animal sources, such as the saturated fats found in beef and pork and the saturated fat found in milk.