Brain fog has causes, not just symptoms. Sleep debt, blood-sugar swings, chronic stress, hormonal shifts, post-viral fatigue and healthy ageing all show up as trouble focusing but respond to different things. Clarity is a free 60-second assessment that narrows down your most likely cause, plus free guides on sleep, blood sugar, movement, energy pacing and nervous-system resets. Optional 14-day protocols ($27) are built from published research (CDC, NIH, Mayo Clinic, The Menopause Society) with sources cited on every page. Educational, self-guided, not a treatment.