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There are many claims made about nutrient absorption, eg "Juicing helps you absorb all the nutrients from the vegetables". I'm curious to know how nutrient uptake is measured.

Eg is it a pure nutrients in vs nutrients out equation? Or are blood levels of nutrients measured before and after consumption?

What ever the methods, are they reliable enough to support claims made about relative absorption rates of certain diets or eating practices?

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closed as too broad by WYSIWYG, Bez, Chris, rg255, James Dec 8 '14 at 16:55

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Depends on the nutrient type. Typically you would need an distinct assay or a molecular sensor for each nutrient type. – WYSIWYG Dec 8 '14 at 12:25

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