The list of nutrients that people are known to require is, in the words of Marion Nestle, "almost certainly incomplete". As of 2014, nutrients are thought to be of two types: macro-nutrients which are needed in relatively large amounts, and micronutrients which are needed in smaller quantities. A type of carbohydrate, dietary fiber, i.e. non-digestible material such as cellulose, is required, for both mechanical and biochemical reasons, although the exact reasons remain unclear. Other micronutrients include antioxidants and phytochemicals, which are said to influence (or protect) some body systems. Their necessity is not as well established as in the case of, for instance, vitamins. COUNT 5
QSN1 Who claims that the list of nutrients that humans require is incomplete? ANS1 Marion Nestle QSN2 What is the other category of nutrients that people require other than micronutrients? ANS2 macro-nutrients QSN3 What is notable about cellulose in humans? ANS3 non-digestible QSN4 What else, other than antioxidants, helps protect body systems? ANS4 phytochemicals QSN5 In which year were nutrients categorized into their two respective categories? ANS5 2014