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______ are a dense source of energy (9 kcal/g) and serve as important regulators of the growth and development of the infant's nervous system.

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The blank field in the task content should be filled with lipids.

What are Lipids?

Nutritionally, lipids are a class for nutrients characterized by the ability to serve as dense source of energy and hence serve as important regulators of growth.

Although, carbohydrates also serve as energy sources in diets, lipids have high energy density.

Read more on lipids;

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