how do we come to know that which nutrient is present in which food item 

Dear Student,

Various tests are performed to know which nutrient ispresent in which food item. For example: to find out the presence of carbohydrate in a particular food item, tests like Benedict's tets, molisch tests can be performed. Similarly there are other tests for other nutrients.

Hope this clears your doubt,

Cheers!!

  • 3

by various food test

hope it helps

  • -1
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