Scientists have discovered that this common phrase, often used to explain why people make poor food choices when they’re hungry, is not supported by evidence. Research found that our brains remain remarkably stable and functioning normally even after fasting or hunger, dispelling the myth that we become a different person when our stomachs are empty.
Source: https://www.telegraph.co.uk/news/2025/11/03/why-saying-youre-not-you-when-youre-hungry-is-wrong