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because the richest sources of vitamin A are foods of animal origin such as liver, fish oil, milk and eggs |
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in case a shortage of vitamin A was not the main problem |
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that, in the typical western diet, about half of the vitamin A was not the main problem |
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if the eating of liver too frequently can cause vitamin A toxicity |
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just as most foods with vitamin A activity are brightly coloured, often yellow or orange |