"Calorie" is a measure of energy. The human body uses this energy and bonds materials into lipids if the energy is not used otherwise. The body can then break down the lipids and obtain energy whenever there is not enough food being ingested.
If you eat too many calories, instead of using them for energy your body stores the energy as fat to use at a later time. It is stored in your liver, muscles and fat cells.
Your body stores that extra energy as fat.
Fat cells.
The body stores the extra energy in the form of sugar and fat.
Carbohydrates are broken down to release energy for the cells in the body. If an excess of energy is produced, the extra energy will be stored as fat.
Cells are not stored an released in the body. Cells are made by cell division.
The body does not "lose" calories, per say. Instead, it uses them. Calories are what provides the body with energy. This energy is what allows things like our heart to beat, for our muscles to move, and to give us the energy to do things like walk and play sports. By doing activities, the body requires energy to do so and it uses the calories stored in our body (first it uses those stored in the liver, which are from what we recently ate / drank, then it moves to energy stored in fat cells around the body).
mitochondria
Calories are only a measure of how much energy you can get from a nutrient or a food source. The more calories you get, the more energy you can burn. However if you burn less calories of what you ingest, you get stored fat. Calories are how we measure energy from foods for our body. When we get more calories than we burn, we store the extra in fat cells. This is how we gain weight. When we eat less calories than we burn, we use the extra calories tored in fat cells. This is how we lose weight.
In a substance called glycogen, found in your muscles. Also, in fat cells called lipocytes. The body generally burns off energy preferentially from fat cells , then glycogen. But, if you are totally depleted of energy stores, the human body can start actually converting protein, which means that in extreme cases you can start losing muscle.
Fats or lipids are molecules that provide energy and insulating body. Carbohydrates are mainly energy stores of our body. proteins have role in our structure and function of the cells.
It stores the excess energy in the form of fat cells, to be metabolized when needed at a later time.