The risks of crash dieting include nutritional deficiencies, muscle loss, and a slower metabolism. Extreme calorie restriction often leads to insufficient intake of essential nutrients, potentially causing health issues such as fatigue, weaken immune function, and hormonal imbalances. Additionally, crash dieting can foster unhealthy relationships with food, promoting cycles of yo-yo dieting and emotional distress. Sustainable weight loss is better achieved through balanced nutrition and gradual lifestyle changes rather than extreme dieting practices.