____ are the chemicals in our food. In order to eat a ____ diet, we must have the right proportion of different nutrients to keep us healthy. Packaged food usually has this information on the ____. For ____ food we can look up the information in nutritional tables. However, scientists have to measure the ____ of nutrients in the first place, and also have to check the nutritional value of foods regularly, to make sure what we eat is healthy and ____. As nutrients are chemicals, we use ____ tests to tell us if they are present in food.

Nutrient Tests - why bother?

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