The 57-year-old actress credits this healthy turnaround to personal trainer-dietitian to Duchess of Cambridge, Louise Parker.
Parker's new book "The Louise Parker Method: Lean For Life: The Cookbook", has hit the stands and the foreward has been penned by Thompson, reported E! Online.
"Louise is the only one out there I trust. I love that her method is not a diet, and is genuinely sustainable. So, I can have my glass of wine and manage to avoid spending the rest of the week eating cheesy Wotsits," Thompson wrote.
"She toughens me up without driving me round the bend with kale juice and the more depressing style of sprout," Thompson added.