Potato fans themselves can not really lose weight, but when they eat properly, they can benefit. Catalan fans usually contain dietary fibres, including some muscular sugar, and contain lower amounts of heat, which, when eaten, can contribute to abdominal saturation in the body, as well as lower promotion indices, i.e. low rates of transformation of consumption into glucose, which can help limit energy. So even if the taro fans themselves do not lose weight, proper eating of the taro fans in the process of losing weight in lieu of staple foods is conducive to the loss of weight。