Bad Thinking Diary May 2026

Why would our brains voluntarily keep a diary that makes us feel terrible? The answer lies in evolutionary psychology.

Our brains are wired with a Negativity Bias. For our ancestors, forgetting the location of a saber-toothed tiger was a fatal error; forgetting the location of a delicious berry patch was just a minor inconvenience. Consequently, the human brain evolved to prioritize negative experiences over positive ones. It is a survival mechanism, but in the modern world, it is a recipe for chronic anxiety and depression. Bad Thinking Diary

The Bad Thinking Diary is this bias made textual. It is your brain’s attempt to "protect" you by anticipating every possible threat. However, because we no longer live on the savanna, this protection manifests as rumination, self-doubt, and imposter syndrome. Why would our brains voluntarily keep a diary

Anxiety feels random. It attacks without warning. But a diary reveals the pattern. You might realize that your bad thinking only spikes on Sunday nights (work anxiety) or after you haven't eaten for five hours (blood sugar crashes). The diary provides data. And data defeats the mystery of fear. For our ancestors, forgetting the location of a

To destroy the Bad Thinking Diary, you must recognize the ink it is written with. Psychologists have identified several specific cognitive distortions that fuel negative thinking. If you recognize these in your internal monologue, you are looking at pages of your Bad Thinking Diary.