Diabetes and gaining weight

Losing that amount of weight so quickly is very concerning. My doctor told me that 0.25kg/week is the recommended safe rate for (intentional) weight loss, so losing 6kg in a week when you weren't trying to is a big problem. While it could be the diet, I would recommend a visit to the doctor to make sure there's nothing else wrong, and to give you further advice about gaining weight and how to manage your diet and exercise. Try to eat more food - I won't try and change your mind about low carb, but try to get some higher calorie meals in. Plenty of meat for example.