"类脂物代谢作用" can be translated into English as "lipidoid metabolism" or more specifically, depending on context, "metabolism of lipid-like substances".
"Lipidoid" is a term that can refer to substances resembling lipids (类脂物).
"Metabolism" is the standard term for the biochemical processes involved in the synthesis and breakdown of substances in the body.
If the context specifically emphasizes the resemblance to lipids but not necessarily being lipids, "lipidoid metabolism" would be appropriate. If a more detailed or technical description is needed, "metabolism of lipid-like substances" could be used.