Fad diets often negatively affect long-term health by promoting unsustainable eating patterns, leading to potential nutritional deficiencies. These diets typically offer quick fixes, encouraging extreme restrictions or eliminations of entire food groups, which can disrupt metabolism and create unhealthy relationships with food. Once the diet concludes, individuals may regain lost weight and experience a cycle of weight fluctuation. Furthermore, some fad diets can be harmful due to lack of essential nutrients, increasing the risk of chronic illnesses. Sustainable approaches foster better health outcomes.