Our expert says:
Basically you can work on 37 kJ per gram of fat, thus 37000 kJ for the kg of body fat, but before you despair, remember that the kg of fat also contain some water. If you reduce your daily energy intake by 2100 kJ per day then you should lose between 0,5 and 1 kg of weight per week - so you have plenty of time before Christmas. The conversion factor for calories to kilojoules is: 1 kcal = 4.2 kJ, thus 100 kcal = 420 kJ and vice versa, so 1 kJ = about 0,24 kcal. Do some regular exercise to shift those last few kgs.
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