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Lipids play a crucial role in energy storage, particularly long-term energy storage, which is one of their primary functions. They are high in energy density, providing more than twice the energy per gram compared to carbohydrates. This characteristic enables organisms to store energy efficiently, which can be utilized during periods of fasting or increased energy demand.

In addition to energy storage, lipids also serve various functions such as forming cell membranes, acting as signaling molecules, and contributing to the insulation and protection of organs. However, in the context of immediate energy supply, carbohydrates are typically utilized first, making lipids predominantly associated with long-term energy reserves.