Since the earth is so large, its force of attraction is far greater than the other forces that exist around us. No, gravity is not needed to make your body work. We know from American and Russian space flights that humans can exist without gravity for many months, and there seems to be no limit to the time a person could live without gravity. However, we also know that the lack of gravity causes certain changes in the body. Many astronauts experience motion sickness, at least for a while.
All astronauts lose some calcium and bone mass.
There is a gradual deterioration of their muscles, since they are not continuously working against the forces of gravity. In space, or on other planets, the availability of air, protection from the solar and space radiation, and extreme temperatures are much more critical problems than reduced gravity. . The long-term effects of no gravity, or reduced gravity, on living organisms or on generations of such organisms is not known. On the surface of the moon, the level of gravity is only about one-sixth of what it is on Earth. The effect of gravity extends from each object, indefinitely into space in all directions.