
3 reasons you can't concentrate — and none of them are your phone. 1. Your cortisol is permanently elevated. Every cup of coffee fires your fight-or-flight response. Do that 3 times a day for 5 years and your brain stops knowing how to come down. Focus requires calm. You haven't had calm in years. 2. Your brain is running out of fuel at the cellular level. Caffeine doesn't create energy. It blocks the signal that tells you you're tired. When it wears off, you crash below baseline — because your real energy systems stopped working years ago. 3. Your NGF has been dropping since you were 25. Nerve Growth Factor is what maintains the neural pathways responsible for sharp thinking. It declines with age, accelerates under chronic stress, and nobody told you it was happening. The good news: depletion reverses. All three of these have a fix.