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| style="height:20px; width:200px; text-align:center;" |Not enough protein causes your organs to swell.
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===Energy===
: We get [[energy]] from our food. [[Carbohydrate]]s, [[lipid]]s and [[protein]]s are all stores of [[Chemical Potential Energy Store|chemical potential energy]].
: We must get the amount of energy we take in and the amount of energy we use the same so that we can keep healthy.
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.