Low carb diets are no more effective than other diets for weight loss. Furthermore, long term low carb diets actually reduce your metabolic rate, different from what the keto tards who say it increases TDEE claim.
Jason Fung is not a PhD. Most MDs get about ten hours or less of nutrition education going through medical school, and I'm being generous here.
If you feel like reading a well researched article on why low carb is bro science gone off the rails, read onhttp://wholehealthsource.blogspot.com/2011/08/carbohydrate-hypothesis-of-obesity.html
By the way, Stephan recently debated the biggest voice of the low carb cult on Joe Rogan's podcast and it was the absolute smack down of all time. Taubes was left for dead.