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How is it known that there are only three macronutrients: proteins carbohydrates and lipids?

Summary The question is based on the misconception that the term “macronutrient” originated as a scientific definition, to which entities satisfying this definition were assigned. In fact it was a ...
David's user avatar
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2 votes

If protein is mostly used by the body for purposes other than extraction of energy, why are calories from protein relevant?

Preamble I had not intended to answer this question as I felt it lacked the clarity required for this site. However I now think that it is necessary to correct the assertion that “protein has to be ...
David's user avatar
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If protein is mostly used by the body for purposes other than extraction of energy, why are calories from protein relevant?

Think about it this way: if you're compiling a budget or asset report then you want to know about cash flows - income vs. expenditures - regardless of what form that "cash" might take. ...
That Guy's user avatar
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4 votes

Is it possible to live without iodine? (sea plants, seaweed or fish?)

Iodine is a component of the thyroid hormones, thyroxine and triiodothyronine, so it is indeed a human nutritional requirement. According to this Harvard University webpage, milk (especially), eggs ...
David's user avatar
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