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| Tanya Zuckerbrot poses in her Midtown apartment in Manhattan, New York, Monday, July 20, 2026. |
Tanya Zuckerbrot is resurrecting F-Factor — and the product at the center of its scandal is coming back exactly as it was.
Six years after allegations that her fiber powders and bars made dozens of women sick ignited a social media war, lawsuits and a public fall from grace, the Manhattan dietitian is preparing to relaunch her brand by spring 2027.
“When we relaunch, I’m bringing back the F-Factor products people knew and loved. I continue to stand behind their formulations because they were developed based on sound nutritional science, and that foundation has not changed,” Zuckerbrot told The Post.
The 55-year-old plans to resume using the original signature powder formula — whey protein, partially hydrolyzed guar gum, stevia and monk fruit — from the same manufacturer.
“Why wouldn’t I?” she said. “The products have now been proven to be safe. I was so proud of this product.”
Zuckerbrot transformed the humble dietary staple into a wellness status symbol — and the foundation of a $40 million business.
A University of Michigan graduate with a master’s degree in nutrition from NYU, she built her reputation through a private Manhattan practice, advising clients on a high-fiber, high-protein approach to weight loss and chronic illness management.
Her mantra: “Fiber and protein at every meal makes losing weight no big deal.”
In summer 2020, New York fashion influencer Emily Gellis began sharing allegations that F-Factor products caused serious health problems, including gastrointestinal distress and hair loss.
The accusations erupted into an Instagram war, with Gellis — who had a history of crusading against brands — publishing more than 4,500 posts in 75 days, including claims that Zuckerbrot sent hundreds of people to the hospital, according to court documents.
Zuckerbrot denied the allegations and sued Gellis for defamation, claiming the alleged smear campaign caused F-Factor’s monthly revenue to plunge from more than $1 million to $90,000.
By 2023, the company had shuttered, leaving more than 20 employees out of work, according to Zuckerbrot.
The defamation case settled in October 2026, with Gellis agreeing to a public apology and $240,000 in payments.
Fast forward to today, Zuckerbrot is preparing to bring F-Factor back with some changes to how the products are presented and used.





