FAQs about Fad Diets What is a fad diet? A fad diet is a weight-loss plan or program that gains sudden popularity and often makes exaggerated claims about quick and easy weight loss. These diets usually focus on a specific food group, eliminate certain nutrients, or promote excessive calorie restriction. However, they are commonly short-term solutions and not sustainable for long-term health. Learn more about fad diets. Are fad diets effective for long-term weight loss? No, fad diets are generally not effective for long-term weight loss. While they may result in initial weight loss, it is often due to water…