Metabolism is inherent in every living organism. Permanent and continuous metabolic process of transforming chemicals and energy occurs in every body. Nutritious substances are digested and chemically transformed, while waste products are eliminated. The released energy is used for maintaining the body cells and providing for its functions, such as muscle contractions, heart working, internals functioning. If you buy vitamins or nutrition supplements - carefully read the instruction as most of them are made for people with a good metabolism.

The unit of measuring for metabolic process is a calorie. One calorie approximates the energy needed to increase the temperature of 1ml of water by 1ºC, which is a minor value. Therefore, body metabolism is normally measured in “larger” calories called kilocalories, 1 kilocalorie is equal to 1,000 calories and its symbol is kcal. SI system uses joule for measuring heat energy, when 1 calorie=4.19 joule, 1 kcal= -4.19 joule. How much energy is required for normal activity of a man during a day and how much energy can be gained from a special vitamins complex? The answer for this question is the key to understanding the reasons for obesity.

It is crucial to know the amount of energy expenditure that leads to the most efficient weight loss and how this may be helpful in successful weight reduction. For an average individual either prone to obesity or overweight this amount is estimated to be 2,200 kcal. One may calculate this amount for themselves by multiplying the normal weight in kilograms by 33 kcal for men or 30 kcal for women. This simplified version is commonly used for calculating rations.

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