a hard-working labourer needs more fats and carbohydrate than those who are working in the office

​Because the labour is using more energy and thus needs more carbohydrates and fats :)
 
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Labourer always have a bunch of work to do. Therefore, they need much energy which they get from carbohydrates and fats.
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Because a hard working labourer do more physical work as compare to working in the office
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