Why do you feel gravity, though not having metal in your body?

The iron in our blood is all oxidized (not pure metal), so people don't react to magnetic fields. We experience gravity because gravitational fields act on mass, not magnetic metals.

There are four fundamental forces: strong force, weak force, electromagnetic force, and gravity. Strong and weak forces hold atoms together, and aren't noticable on a human-size scale. Electromagnetic forces act on positive and negative charges and on magnetic fields, and act on quantum to galactic scales.

Gravity, the fourth fundamental force, pulls masses together, and is most noticible at very large scale - we don't notice gravity pulling us toward another person, because the mass of people is too small to generate obvious gravitational fields. Gravity's directly proportional to mass - double the mass, and you double the gravitational force. It's inversely proportional to the square of distance - move things two times closer together, and the gravitational force will be four times as strong. In mathematical terms, the force due to gravity on two objects is:

F = (G x m1 x m2)/ r^2

where F is the force of gravity, m1 and m2 are the masses of the two objects, and r is the distance (radius) between their centers of mass. G is a constant (6.67 x 10^-11 m^3 x kg^-1 x s^-2). Note that 10^-11 (100 billionths) factor. With a constant that tiny, you need a lot of mass to generate any force.

Gravity attracts objects to one another, but we don't notice its effect with everyday objects because their mass is relitively insignificant with respect to the earth.

This is why astranauts 'weigh less' on the moon and float about in space.

However the moon's gravity upon the earth affects a number of things such as tides and other natural phenomina. The position and proximity of the moon to the earth effectively pulls or puts the oceans under gravitational pull in certain directions at given times.

Gravity and magnetism are two different things.

Gravity is not a magnetic force.Yes the earth has a magnetic field and does affect magnetic metals but that is not gravity. Gravity attracts all masses, metals and non metals alike.

Our body's are full of metal, your bones are made of Calcium (which is a metal) for a start, not to mention all the Iron and Zinc and a host of others, that and the fact that its all about mass, which as an almost solid lump, we all have to conform to gravity.

Gravity is caused by mass. Nothing to do with metals or the like.

Ditto. Gravity has very little to do with magnetism.

Having said that, I hope you have a little iron in your body, or you will be quite anaemic.

Gravity is NOT magnetism.

Because levity - gravity's counterpart force - is interrupted by the literality field surrounding the individual.