One-month weight loss varies widely. In time-restricted eating studies, average losses are often modest; meta-analyses report roughly ~1–2 kg on average for 16:8-style approaches, with large individual variation. The main driver is the sustained calorie deficit and adherence, not the fasting window itself. A realistic target is ~0.5–1% of body weight per week (e.g., 0.4–0.8 kg/week for an 80-kg person). Faster early drops can reflect water/glycogen. Protect lean mass with adequate protein and resistance training. Extremely rapid loss is harder to sustain and may raise side-effect risks; prioritize a moderate deficit with high-quality food, movement, and good sleep.