Signs of healthy weight loss include gradual progress—typically 1-2 pounds per week—alongside improved energy levels and enhanced overall well-being. Conversely, signs of unhealthy weight loss may involve extreme caloric restriction, significant fatigue, nutrient deficiencies, or psychological distress. Rapid weight loss can lead to muscle loss rather than fat loss and may foster an unhealthy relationship with food. It's essential to aim for sustainable changes through balanced eating and regular exercise for lasting results.