17 March 2009

BurgerEnergy expenditure is usually measured in units of kilojoules or kilo-calories, often called Calories. Energy expenditure of an adult with low-moderate levels of physical activity is about 2000 Calories. Of course, every day, people expend energy continuously, even when you’re sleeping, the body still using energy.

The lowest level of energy usage is known as the basal metabolic rate, or BMR. The BMR of every individual is different and influenced by many facChickentors, including percentage of muscle tissue, growth and repair demands, state of health and ambient temperature. Physical activity levels also vary and have direct impact on energy expenditure. The more vigorous the activity, the longer it is continued, and the more muscles in the body that are used, the greater the total energy expenditure.

The other side of the energy balance is energy intake and this is determined by the energy consumed from eating. Energy content of foods and diets is also measured in calories or kilojoules. Three types of macro-nutrients, proteins, fats and carbohydrates also supply calories.

The important thing to remember is that a calorie is a calorie regardless of whether it comes from fat, protein or carbohydrate. Over-consumption of nay food can tip the balance towards weight gain!

Energy content of foods
Nutrition BalanceMost foods are a mix of carbohydrate, fat, protein and water. Many plant foods contain indigestible fibrous parts. Water and indigestible dietary fiber are essential to good health, but do not provide calories. Similarly, vitamins and minerals which are needed for good health contain no calories.

The energy/Calorie content of any food can be measured using analytical techniques in a laboratory. The energy content of a food can also be calculated by multiplying the each macro-nutrient in the food by the Calorie values.

Many packaged foods make calculating calories easy, by carrying information about the energy content of the food on the label. This information is usually described in calories per serving or per given weight.


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