Most health guidelines suggest 0.5–1kg (1–2 lbs) per week is a sustainable, safe pace for most adults. Faster loss often means muscle loss, not just fat, and is harder to maintain long-term.

No, but it helps some people. Calorie counting is one tool among many, portion control, whole-food-focused eating, and consistent habits can work just as well for many people without tracking every number.

It depends entirely on the supplement and the person. Some have real evidence behind them; many marketed for rapid weight loss don't. Always check for third-party testing and realistic claims.

A "diet" usually implies a temporary restriction with an end date. A lifestyle change is a sustainable shift in habits meant to last indefinitely, which is generally why it tends to produce longer-lasting results.

Visible changes often take 3–4 weeks of consistency, though this varies by individual. Non-visible improvements, like energy levels and habit-building, often start much sooner.