What portion sizes are you eating?

I think it's probably best to talk to a qualified dietician rather than randomly picking fad diets from Internet forums. Especially if you're medically overweight your GP should be able to refer you to one. Low carb diets are a rather old-fashioned idea and no longer recommended for weight loss, although you'll still find some people suggesting them. These days the main principle is to reduce calories with the understanding that calories from fat or protein are exactly the same as calories from carbohydrates. Like I say, it's best to talk things through with someone who knows what they're talking about and understands what you're trying to achieve.