Overeat often implies a lack of control or overindulgence, which is considered negative. I knew I overate when I couldn't button my pants.
Pro Tip 2/3
Feeling Sick
Using 'overeat' usually indicates a possibility of physical discomfort or illness after eating too much. He overate at lunch and felt queasy all afternoon.
Pro Tip 3/3
Special Occasions
People often overeat during celebrations or holidays due to the abundance of food. Everyone tends to overeat on Thanksgiving.