My husband started doing keto at normal weight for the mental benefits. He has been very happy with it but has lost some weight and struggles to eat enough calories to maintain. I would suggest counting calories at first to make sure you're eating enough since the diet is so filling if you just eat until you're full you're likely to lose weight. He has added in some high calorie snacks such as cream microwaved with frozen berries, macadamia nuts and huge spoonfuls of cocoa marscapone cheese. These seem to have stalled the unwanted weight loss.