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→Energy
|[[File:EnergyActivities.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |The amount of energy in each [[nutrient]] used per [[gramhour]].
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: If we take in too little [[energy]] we feel tired (finding it hard to think), get fatigued (finding it hard to move), and feel cold (finding it hard to keep our body temperature at 37°C). However if we take in too much [[energy]] our body stores energy in [[Fatty Tissue|fatty tissue]].
: The average adult [[male]] needs to eat around 10,000[[kJ]] per day and the average adult [[female]] needs to eat around 8,000[[kJ]] per day. The amount of food and type of food determines how much [[energy]] is actually consumed.