Eat This Much is an automatic meal planner that allows users to create customized meal plans based on their dietary needs and preferences. The planner supports various diets, including keto, vegan, paleo, and Mediterranean, and provides features such as automatic grocery lists and integration with Instacart and AmazonFresh. Users can create a free account and access additional features, including the ability to edit macro targets and change cook times. The planner aims to reduce food waste and make meal planning easier and more efficient.