Junde Guo's post on Goodwall - O17 2020 Challenge 4 According to FAO, nearly one third of food is lost or wasted over the world annually, though many regions are suffered from food shortage. Here are my solutions using AI. First, in the consumer stage, apply AI to sort food into several groups according to the “best before” and “use by” dates, making people aware of when the food will go bad and eat them in a proper sequence. Second, in the retailing stage, AI could tell shops which food should be stocked more according to big data about customers, avoiding overstocking. Besides, AI could also uses data to decide the prices of different foods with marketing principles, helping shops sell out all the food. Third, in the primary producing stage, AI could be used in agriculture in many aspects to avoid food lost, like evaluate how much water and fertilizer should be given to crops.