Metabolic protein explains how flies choose 'healthy' food

Many animals, including humans, have a preference for nutrient-balanced diets. Among all essential nutrients, multicellular organisms need to consume the building blocks of proteins, called amino acids, in order to build proteins of their own. Humans might decide on the best foods for them by reading nutrition labels, but it’s less clear how other animals inherently “know” which foods they need to function.


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Source: Phys.org