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In order to answer this question effectively I'll explain in terms of lemons' skin and the actual juice. Lemons, like other fruits, have skin and seeds that are largely made up of a complex carbohydrate called cellulose. Humans are unable to digest it; cellulose is also a component of fiber which helps with digestive issues. The juice itself is mostly water and citric acid (hence the category of citrus fruits). Lemons are yellow because it's photosynthetic cells reflect the wavelengths that make things appear yellow rather than absorb it.

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13y ago

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