your body uses it for energy
Vitamins
In many cases, the human body is unable to process the carbohydrates locked in the plant's cell walls. This is dietary fiber and passes through the digestive tract mostly unchanged.
When your body needs energy, it will first use carbohydrates stored in your body, sparing the protein and fats in your body. When the stored carbohydrates are depleted, the body will start using protein and fats.
Sugar and carbohydrates are stored as body fat. This is extra energy that the body doesn't need and so it is stored as fat.
Liver
No, fats are used as energy once your body has no carbohydrates left to burn.
You will put on weight, as they are converted to fat, which is stored by the body.
Both of them give you energy. Carbohydrates do not produce anything in your body. Fats are stored in body in large scale and give shape and smoothness to your body.
Carbohydrates provide energy for the body. These are broken down into glucose or glycogen, and are stored in their designated areas in the body. The body then uses these reserves whenever active, cold, hungry, or sick.
Carbohydrate and fat
Carbohydrates are absorbed by the body and converted into glucose. The glucose can be stored as fat or as glycogen in the liver or the muscles. There is no short term storage of carbohydrates.
Carbohydrates are broken down to glucose molecules which can only be stored in very small amounts. Excess glucose which are not readily used are converted into glycogen and stored in fatty tissues of the body.
Carbohydrates, if not used by the body, are stored as fat. Not all carbohydrates are converted to fat. Upon consumption the carbohydrates may be converted to glycogen for fast use by the body.