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Estimating my equilibrium energy intake during lockdown: very introspective study. OBJECTIVE: To estimate the daily dietary energy intake for me to maintain a constant body weight. How hard can it be? DESIGN: Very introspective study. SETTING: At home. In lockdown. (Except every Tuesday afternoon and Saturday morning, when I went for a run.) PARTICIPANTS: Me. n=1. MAIN OUTCOME MEASURES: My weight, measured each day. RESULTS: Sleeping, I shed about a kilogram each night (1.07 (SD 0.25) kg). Running 5 km, I shed about half a kilogram (0.57 (SD 0.15) kg). My daily equilibrium energy intake is about 10 000 kJ (10 286 (SD 201) kJ). Every kJ above (or below) 10 000 kJ adds (or subtracts) about 40 mg (35.4 (SD 3.2) mg). CONCLUSIONS: Body weight data show persistent variability, even when the screws of control are tightened and tightened.