Losing weight too quickly can have negative health effects and is generally not recommended. While it can be tempting to go for quick results, a more gradual weight loss approach is safer and more sustainable. Losing 1-2 pounds (0.5-1 kg) per week is considered a healthy rate of weight loss. Rapid weight loss can result in muscle loss, nutrient deficiencies, a slower metabolism, and an increased likelihood of regaining the lost weight.