Functions of fats in the body include:

1. Energy production: Fats are a dense source of energy, providing more than twice as much energy as carbohydrates and proteins. They are an important source of fuel for the body, especially during prolonged exercise or periods of fasting.
2. Insulation and protection: Fats provide insulation and protection to the body by forming a layer around the internal organs and helping to regulate body temperature.
3. Hormone production: Fats are essential for the production of hormones, such as estrogen and testosterone, which regulate many physiological processes in the body.
4. Absorption of vitamins: Some vitamins, such as vitamin A, D, E, and K, are fat-soluble, meaning they need to be consumed with fats to be properly absorbed by the body.
5. Brain function: Fats are an essential component of brain tissue and are important for brain function, memory, and learning.

Sources of fats include:

1. Animal fats: Animal-based foods, such as meat, dairy products, and eggs, are rich sources of saturated and monounsaturated fats. Some animal-based sources of fat, such as fatty fish like salmon and sardines, are also rich in omega-3 fatty acids.
2. Plant-based oils: Oils made from plant sources, such as olive oil, canola oil, and sunflower oil, are rich sources of monounsaturated and polyunsaturated fats.
3. Nuts and seeds: Nuts and seeds, such as almonds, walnuts, chia seeds, and flaxseeds, are rich sources of healthy fats, including omega-3 and omega-6 fatty acids.
4. Avocado: Avocado is a good source of monounsaturated fats and dietary fiber.
5. Coconut and palm oil: Coconut oil and palm oil are high in saturated fat and should be consumed in moderation.