Yes we weigh less at the equator than at the poles though the difference is negligible. This is because of the distance. As we know, the more closer we are towards the core of a body, the more gravitational force acting on us, Since gravity is directly proportional to the distance and mass. The Earth is more or less shaped like a potatoe therefore it's poles are slightly closer to the core unlike the equator. In simple words the distance from north pole to south pole is smaller than the distance from east to west. Therefore since gravity is directly proportional to the distance and mass, we observe that we weigh less at the equator compared to the poles though the difference is negligible. This exaggerated illustration shows how the earth bulges at the equator. As a result, people at sea level at the equator are farther from earth's center and experience less gravity than people at sea level at the poles. Public Domain Image, source: Christopher S. Baird. Hope it helps :) Stay Safe, Stay Curious, Keep Learning, Keep Growing..... Thankyou!!!