The promoter for ketone body synthesis provided by the present invention is characterized by comprising a combination of a medium chain fatty acid fat/oil with at least one kind of casein compound which is selected from the group consisting of casein and salts thereof. By taking into the body the casein compound together with the medium chain fatty acid fat/oil, ketone body synthesis from the medium chain fatty acid fat/oil in the body can be promoted, compared with the case of taking the medium chain fatty acid fat/oil alone, and thus the ketone body concentration in the body can be efficiently increased.本發明所提供之酮體生成促進劑，其特徵在於：將中鏈脂肪酸油脂，與選自由酪蛋白及其鹽所成的群組中之至少一種的酪蛋白化合物組合而成。藉由將酪蛋白化合物與中鏈脂肪酸油脂一起攝取至體內，相較於單獨攝取中鏈脂肪酸油脂的情況下，在體內來自中鏈脂肪酸油脂的酮體生成被促進，而能夠有效率地提升體內的酮體濃度。
