Low-fat, high-carbohydrate diets are recommended by various scientific bodies for the prevention of coronary heart disease. However, these diets increase postprandial lipaemia and so their net benefit for coronary heart disease risk has been the subject of vigorous debate. Exaggerated postprandial lipaemia has been implicated in the development of atherosclerosis. Previous research suggests that physical exercise improves triacylglycerol metabolic capacity. The present thesis investigated whether exercise, when simultaneously adopted with a high-carbohydrate diet, could prevent the augmentation of postprandial lipaemia observed with this dietary change.