The effect of a mixture containing MCT was compared with that containing four kinds of LCT (oliveoil, sunflower oil, lard and butter), by means of X-ray examination. MCT test meal evacuates the stomach of animals at a slower rate than the other test meals containing LCT. Accordingly, the MCT-test meal slows down the process of filling of the caecum and retards the evacuation of the small intestine. In man gastric evacuation of the MCT-test meal is also slower as compared with the olive oil test meal. It is probable that better utilization of MCT in malabsorption states can be partly explained also by slower gastric evacuation.