Discussion: I saw on TV a show that claimed that movie actors have a secret program for a fast diet? Is it true?

Film actors required to lose weight for their role hire an expert production team, including a cook and a private fitness trainer. They break away from the hassles of everyday life and devote their time to toning the body. Their diet is natural, measured, varied, and based on high-quality ingredients, without any industrialized food and beverages, along with a grueling training regimen. Is there anything secret here? It seems to me not.

Link: Why do many weight loss diets fail in the long run?
https://www.sf-healing.com/page/214 (Copy & Paste)