Carbs can cause weight gain But there's a big difference between weight gain and fat gain. Our body breaks down carbs and stores them in our muscles as energy in the form of glycogen. With every 1 gram of glycogen it holds onto an average of 2-3 grams of fluid. This is explains your sudden sudden 24hr weight spike after a big bowl of pizza or pasta. To can 1kg body fat you need to consume 7700 calories above your maintenance calories. Carbs are not to be avoided for weight loss. Carbs energise o