The fastest scale drop often comes from water loss: suddenly reducing carbs, lowering sodium, or using very low-calorie diets can move the scale quickly. But that is not always fat loss and may not be sustainable. For lasting results, the most effective method is a reasonable calorie deficit, higher protein intake, resistance training, and regular walking. This may look slower, but it improves true fat loss and reduces rebound. Instead of chasing “fastest,” aim for “smartest and sustainable” to win long term.