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Energy has traditionally been expressed as calories or kilocalories. More recently, the units of energy have been changed to kilojoules. There are 4.2 kilojoules in 1 kilocalorie. Someone having 2000 kilocalories each day would be having 8400 kilojoules, also known as 8.4 megajoules.
Cravings can affect even the most determined dieter. So you could try the following tips to help you cope with and resist temptation: # Don't skip meals, as this will make you crave more for food items and snacks because you feel hungry. # Don't starve yourself, as this is likely to lead you to give into temptation. Keep healthy snacks, ( like fruits or carrot/celery sticks) handy at all times.
# Don't store food you crave for, in the house, and don't go shopping when you're hungry as you're likely to be tempted with the variety displayed. # As with any craving, distract your attention from it - go for a walk, have a bath or watch television. # Indulge once in a while, so that you don't deprive yourself completely as this could be your downfall. If you crave for chocolates, allow yourself a small size chocolate bar and don't feel guilty about eating it. (Based on Net resources)
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The energy value of a food indicates its value to the body as a fuel. After a food is ingested, some of its energy may be 'lost' during digestion and metabolism. Although the energy value of some foods has been found by combustion in a bomb calorimeter, more usually the amounts of the macronutrients - fat, protein, carbohydrate and alcohol (ethanol) - in food are taken into account when assessing the total energy value of the food. The energy value for each macro-nutrient must be known, and allowances made for body losses. 
Fat is the most energy-dense macronutrient, followed by alcohol, protein and carbohydrate.
Energy requirement can be thought of as the amount needed to maintain the basic processes of life at rest, that is, the basal metabolism, plus the amount needed for physical activity under a variety of circumstances. Body weight is an important factor in determining how much energy we need, since more energy will be needed to sustain and move a greater body mass. 
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Drink plenty of water as dehydration can sometimes be mistaken for hunger and can increase cravings, especially for sweet food. Water will also make you feel full, so you would feel less hungry.
