“lost even more, shedding 3.7 lbs, or 1.7 kgs a day.”
I call B.S. Almost 4 pounds every day? I think not.
Yes, that’s too much. A very large person, 400lbs>, might lose a 4 pounds a day on a very caloric restrictive diet...but a person trying to lose 20 or 40 pounds is not going to see that no matter what they are drinking.