The present invention herein provides an agent or a food for inhibiting a postprandial increase in blood neutral fat level. The optical element can be a small-gauge, diffusive optical element having circular or semi-ellipsoidal incident surfaces. The wire is wound around a pulley. Temperature detection member disposed near or abutted against other end of penetration member on face B detects transmitted heat, outputting signal. The dielectric fluid, heat transfer fluid, or cooling fluid can comprise one or more glyceride and fatty acid mixtures extracted from an ethanol process. It then drives on the rails into the city with no stops.