Medifast is a weight loss program that focuses on meal replacement products, including shakes, bars, and soups. It is designed to help individuals lose weight by providing structured meal plans that are low in calories but high in protein. The program encourages participants to consume several small meals throughout the day to maintain energy levels and reduce hunger. The Medifast plan typically includes a combination of pre-packaged meals and fresh foods, allowing for flexibility in meal choices. It is often recommended for those looking to lose weight quickly and safely, with support from health professionals to ensure proper nutrition during the process.