The article examines the rise of domestic science in territorial‐era Hawaiʻi. At the dawn of the twentieth century, as the Pacific became a new frontier, ‘manifest domesticity’ emerged as a prominent dynamic, and home economics became linked to empire‐building. At the centre of this phenomenon was Carey D. Miller, a self‐proclaimed ‘pioneer’ whose pursuit of nutritional research and reform was inseparable from American expansionism. The Pacific was complex terrain, however. Japan also was asserting influence in the region, dispatching emigrant workers and pursuing its own ambitions of settler colonialism in which the home and homemaking, including dietary reform, also assumed exceptional significance.