Hello, and welcome to the Ketogenic Forums!
Weight loss always slows the closer your body is to a healthy weight. And remember, it’s fat loss you want, not lean tissue loss, so if your body decides to put on a bit of lean mass while at the same time shedding excess fat, that’s not a bad thing.
The key to reversing fatty liver disease is to avoid sugar and ethyl alcohol. Table sugar, sucrose, is composed of a glucose molecule bonded to a fructose molecule. The glucose from sucrose is handled in the body the same way as glucose from any other carbohydrate, but fructose and ethanol can be metabolised only in the liver, and by the same metabolic pathway, at that. This pathway can handle only so much of a load at any given time, so if it gets overloaded, fat builds up in the liver, with potentially serious consequences. But this excess liver fat is practically the first to be metabolised once we change our diet to stop overloading the liver with fructose and ethanol. One small study on obese children with fatty liver disease showed a marked improvement in their livers in just ten days of a low-fructose diet, so you can do yourself a lot of good in a very short period of time.
You don’t say how tall you are, so it’s not easy to say whether 13 st 3 is a good or bad weight for you. If you are over six feet tall, you may have a difficult time persuading your body to shed more fat. If you are only five feet tall, that would be a different story.
The key is to keep your total carbohydrate intake as low as you can, in addition to cutting out sugar entirely (and the alcohol as well, for the moment). That alters your hormonal response to the food you eat in a very healthy way. The principal hormone that stimulates fat storage is insulin, and a well-formulated ketogenic diet will lower your insulin levels considerably, whether you wish to fast or not. (Remember as well that fasting is much easier once your body has become reaccustomed to metabolising fatty acids in place of glucose.) But losing excess fat will not occur, even on a low-carbohydrate diet, if you skimp on the calories, which is why we strongly advise eating to satiety. If you keep your carbohydrate intake as low as possible (we recommend an upper limit of 20 g/day), eat a moderate amount of protein, and fill in calories with fat (which has almost no effect whatsoever on your insulin secretion), you will be able to trust your appetite as a guide to how much to eat.