* High Energy Density: Fats contain a lot of energy per gram compared to carbohydrates or proteins. This makes them efficient for storing large amounts of energy in a small space.
* Hydrophobic Nature: Fats are hydrophobic (water-repelling), meaning they don't attract water molecules and don't add extra weight from bound water. This allows for compact storage.
* Insulation: Fat layers also provide insulation, protecting cells and organisms from temperature extremes.
While carbohydrates (like glycogen) can also store energy, it's mainly used for short-term storage. This is because:
* Lower Energy Density: Carbohydrates have a lower energy density than fats.
* Water Binding: Carbohydrates are hydrophilic (water-attracting) and hold water molecules, making them bulkier.
In summary, lipids are the preferred choice for long-term energy storage due to their high energy density, hydrophobic nature, and insulating properties.
