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For Energy.
Either Energy, Or Body Fat.
Carbs provide energy for the body to function, if you do not have enough energy for your body to lift weights, you won't be gaining any muscle because you won't be able to lift, or you will just overtrain.
energy storage
carbs
There are three main nutrients that provide energy which are carbohydrates, proteins and fats. They are also called macronutrients and are needed for metabolism, growth and other body functions.
Carbohydrates (often called "Carbs" for short) provide the body with a ready source of energy, although other forms of food such as fats and proteins can also be used for this. When absorbed from the gut and metabolized they provide the glucose that cells convert to energy. The greatest consumer of glucose in the body is the brain.
Carbs turn into sugar and that is what your body runs on for energy then it stores the leftover sugar and turns into fat, so if u take carbs out of your diet your body needs something else to run on. So it will start burning your body fat and turn it into energy.
Foods high in fat have the most energy per gram (i.e. 9 calories/gram vs. 4 calories/gram for carbohydrates or proteins). This is why it is easy to get fat if you eat fatty food and are not performing work involving lots of physical labor to burn those calories.
Yes your body looks to carbs for energy first because this is the first and quickest energy source. This is why footballers etc take part in carb loading as they can get their energy after. Then after carbs we use our fat reserves for energy.
carbs are ideal for energy
Carbohydrates (often called "Carbs" for short) provide the body with a ready source of energy, although other forms of food such as fats and proteins can also be used for this. When absorbed from the gut and metabolized they provide the glucose that cells convert to energy. The greatest consumer of glucose in the body is the brain.