It’s not news that fad diets aren't the best in regards to long-term weight loss. There’s plenty of evidence that any diet or cleanse that calls for making extreme changes like drastically cutting calories or avoiding entire food groups is unsustainable, and can even lead to disordered eating habits and bingeing.

The latest fad to get called out for being ineffective and potentially harmful is the F-Factor Diet, created by celebrity dietitian Tanya Zuckerbrot. High-profile clients reportedly pay $15,000 for the plan and personal sessions with Zuckerbrot, but the diet is also available to the masses in book form, with The F-factor Diet: Discover the Secret to Permanent Weight Loss.

The diet isn't necessarily new—Zuckerbrot published her book in 2006—but this summer, wellness influencer Emily Gellis Lande began posting on her Instagram stories other women’s complaints and bad experiences on the F-Factor diet, particularly after eating F-Factor’s branded bars and supplements. The purported side effect included hair loss, amenorrhea, rashes, lost periods, disordered eating habits, and GI distress. And although The New York Times reports that some of the more extreme claims may have been fabricated, nutrition experts have long had serious concerns about the diet and how restrictive it is. Here's what registered dietitians want you to know about the eating plan.

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