Why weekly averages matter more than daily snapshots
Most people cycle between lower intake on weekdays and higher intake at weekends. A Monday where you eat 400 kcal below maintenance and a Saturday where you eat 600 kcal above it produce a modest net surplus of 200 kcal for those two days—but seen in isolation each day looks like success or failure.
Weekly balance smooths these fluctuations. The 7,700 kcal/kg approximation then converts net weekly balance into projected weight change, giving an accessible planning metric.