Fast food is food cooked in bulk and kept warm or reheated to order. It originated in the 1800s and became popular in the 20th century due to increasing busyness and convenience. Fast food can now be found almost anywhere. While fast and convenient, it is also often highly processed and less nutritious than non-fast food options. Regular consumption of fast food has been linked to increased risk of obesity, heart disease, and depression. Solutions to promote healthier choices are needed.