I think Pam is talking about Peter Fitzsimmons, he has lost a lot of weight, but he is a big guy. (tall etc) and he had a bit to lose. I only have 5 kilos to lose and I have not lost anything really. You can certainly eat enough calories to maintain your weight and even put it on if you over eat the carbs (low sugar bread, potatoes, rice crackers etc)
My husband has lost 6 kilos in about 6 weeks, but it has slowed right down, but we are eating cheese, butter, bread etc and we are snacking - it's still easy to overeat if you are an emotional eater- that does not change!