What does catabolism generate that is used in anabolism?

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Catabolism provides the raw materials for biosynthesis by generating precursor molecules that serve as the building blocks for anabolic pathways. As nutrients are broken down, metabolic routes produce small carbon skeletons and metabolites such as pyruvate, acetyl-CoA, and other TCA cycle intermediates, along with various sugar phosphates. These precursor metabolites are the substrates that anabolic processes use to assemble proteins, nucleic acids, lipids, and carbohydrates. Energy and reducing equivalents generated during catabolism (like ATP and NADH) also support biosynthesis, but the direct feedstock for building new cellular components is the pool of precursor molecules.