I've been low-carb (usually in the 50 to 100g range per day) for about a month now and during that time have lost approximately 4.5kg in weight. It is worth bearing in mind though that the reason I went low-carb was to reduce my blood sugar levels (and it's working), and the reason for the weight loss (which I'm also targeting) is that I'm also running a calorie deficit (i.e. eating significantly fewer calories than I'm burning) - and it's the latter that's responsible for the weight loss. It'd be quite easy to still eat a lot of calories on a low-carb diet (especially with cheese and the like) and therefore not lose weight.