I follow this guy on YouTube and have been doing the exact same thing, same coffee, meals ect 4000 calories, sometimes more. I'm 168 pounds and after 20 days i lost no weight, i also gained none either, for the entire period my weight fluctuated up and down 2 pounds. Due to practically zero carbs you don't store any fat you dont use, just shit it out. If i eat less than 2500 calories of fat a day i loose weight. I'm small framed so bigger guys could probably loose weight on 3500_4000 a day.