Many celebrities try out the latest dieting fads and cleanses, but Gwyneth Paltrow learned first-hand that some are just not safe.

During a recent interview with the UK's Telegraph, the blonde beauty discussed an experience from back in her 20s. "I've done juice cleanses in the past, and in my twenties I did the Master Cleanse, which left me hallucinating after 10 days. Be aware: a juice detox can crash your metabolism and lead to future weight gain."

In addition, the Goop creator talked about the importance of measuring weight loss in inches versus pounds. "There is something punitive about weighing yourself. It can leave you vulnerable to shame and guilt, and it messes with you psychologically"

"Women naturally gain and lose weight during their monthly cycle anyway, so it can be more realistic to monitor your body shape with a measuring tape," Miss Paltrow added.