Fad diets often have negative health implications, primarily due to their restrictive nature and lack of nutritional balance. These diets can lead to nutrient deficiencies, metabolic issues, and an unhealthy relationship with food, as they frequently rely on extreme caloric limits or elimination of whole food groups. While they may promote quick weight loss, the results are often unsustainable, leading to a cycle of yo-yo dieting. Additionally, fad diets can increase the risk of disordered eating patterns and adversely affect mental well-being, making them a less desirable choice for long-term health.