Our expert says:
If you are an adult woman who is not trying to lose weight you would require 8400 kJ a day to maintain your normal weight. 60-70% of this energy is required to just keep your body going - the so-called Resting Energy Expenditure (REE) which in the given case would equal 5040 kJ. About 10% of the energy requirement is used for the thermic effect of food (i.e. to digest food, etc) - thus 840 kJ. The rest of the energy is used for physical activity (15-30%). Factors that will increase the REE are: male gender, young age, certain hormones (thyroid, testosterone) and percentage of muscle tissue.
Hope this fills some of the gaps
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