Others are diagnosed too late to prevent the dramatic impact of the disease on the eyes, kidneys, nerves and circulation. In Tonga, for example, traditional low-fat sources of protein, such as fish, cost between 15 per cent and 50 per cent more than either lamb flaps or imported chicken parts. The local taro plant costs more than imported starches such as bread and rice. Thus, "not only are the health consequences of these imported foods detrimental, but the availability of these cheap imports is also constraining the development of domestic markets". In the Pacific, diabetes is present in 44 per cent of the Torres Strait Islanders of Australia, 28 per cent of the residents of the Kingdom of Tonga and 22 per cent of the residents of Nauru.