Calorie Deficit
The single most important factor for weight loss is always a calorie deficit. From a scientific standpoint whether you gain weight or lose weight is determined by the first law of thermodynamics which states that energy cannot be created or destroyed, it can only be transformed from one type to another.
I don't want to turn this into a physics lesson but when applied to dieting, the first law of thermodynamics states that your body weight is dependent only on the difference between the amount of calories that you consume versus the amount of calories that you burn, which is known as your caloric balance.
Before we go into the different forms of calories balances, let's first talk about what a calorie actually is. A food calorie is the amount of energy needed to raise the temperature of 1 litre of water by 1 degree Celsius. As you can see, calories are a form of energy measurement.
When you eat food, you are consuming the energy that is stored within the food. Your body then uses this energy to produce movement and keep your organism alive. Alternatively, if not all energy is used right away it can also be stored for later use. Some energy can be stored in the muscles and liver as glycogen, but these stores fill up pretty quickly so your body will then stored any additional calories in the form of body fat.
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