World’s ‘oldest meal’ discovered in 550-million-year-old fossil
https://edition.cnn.com/2022/11/25/world/oldest-meal-550-million-year-old-fossil-intl-scli-scn/index.html
It depends on the definition of creature. If we define it as a thing which simultaneously collects chemical substance and emits it after chemical reaction, there would be much older meals.