https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2716748/

Your medical professionals are misinformed. A celebrity chef promoting a diet, quack as they may be, doesn't mean it's without merit.

FWIW I've both lost weight and improved my T1 diabetes control through a paleo/keto style diet I've been following for the past four years. My endocrinologist has never had anything negative to say about my diet or lifestyle.