What molecule provides long-term energy storage in the body?

The molecule that provides long-term energy storage in the body is triglyceride, which is a type of lipid. Triglycerides are composed of three fatty acid molecules linked to a glycerol molecule. They are stored in adipose tissue and serve as an essential energy reserve. During periods of energy deficit or excessive energy expenditure, triglycerides can be broken down into glycerol and free fatty acids through a process called lipolysis, which can then be used by the body for energy.

Additionally, glycogen is another form of energy storage, found primarily in the liver and muscle tissues, but it serves more as a short-term energy reserve compared to triglycerides. Overall, triglycerides are the primary molecules for long-term energy storage in the human body.