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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.
==Key Stage 4==
===Meaning===
Having a '''balanced diet''' means eating a variety of food to make sure you get the right amount of; [[carbohydrate]]s, [[protein]]s, [[lipid]]s, [[vitamin]]s, [[mineral]]s and [[fibre]].
===About a Balanced Diet===
: A '''balanced diet''' supplies the right amount of different [[nutrient]]s to the [[Cell (Biology)|cells]] in the body.
[[Cell (Biology)|Cells]] need:
*[[Glucose]] - A [[carbohydrate]].
*[[Fatty Acid]]s - Part of [[lipid]]s.
*[[Amino Acid]]s - The building blocks of [[protein]]s.
*[[Vitamin]]s
*[[Mineral]]s
===Balanced Diet and Disease===
: Having a '''balanced diet''' can reduce the risk of a number of [[disease]]s including all [[Deficiency Disease|deficiency diseases]], [[Coronary Heart Disease]], [[diabetes]] and [[cancer]].