[boonie stomper]

yes...
every carb gram, every fat gram, every protein gram is capable of producing a specific amount of energy, measured as a number of calories. Low carbing gives your body a chance to burn fat as its primary fuel source, which it does so less efficiently than when running on carbs mainly. If its converting fat to ketones for your body's needs some are passed in urine. Thus there's an advantage in your weight loss. Less energy must be expended to eliminate the equivalent calories than it would take if you weren't low carbing. If you exercise, the rate you burn fuel increases.