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Post a reply: Type 1 and Type 2 Nutrients

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I have been reading several articles on classification of nutrients as type 1 and type 2 based on how the body responds to their deficiencies. I am confused that all vitamins are considered type 1 nutrients which, under this classification, do not affect growth. Well we know that vitamin A regulates cell differentiation and thus growth. So, even if all type 2 nutrients were adequate, a deficiency in vitamin A should still be affecting growth. Also, it is not clear to me if this classification is taking into account nutrient-nutrient interactions. e.g. Zinc a type 2 nutrient interacts with Vitamin A. Thanks
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