According to Einstein's theory of relativity, time is not an absolute concept but rather relative to the observer's frame of reference. Einstein's work revealed that time slows down near objects with extreme gravitational pull, like black holes. This time dilation is caused by the black hole’s immense gravity curving spacetime in a way that affects all measurements of time and space nearby.

Using this theory, we can hypothetically conceive of a way to slow our own time. Of course, any actual time dilation on Earth would be negligible. However, for conceptual purposes, let’s think on a planetary scale.

Mass and gravity are interlinked - greater mass equates to stronger gravitational pull. In theory, if one gained an unrealistic amount of mass, say the weight of a sun, their gravitational pull would become immensely strong, leading to the curvature of spacetime and consequently, a slower passage of time for them relative to others.

So theoretically, by gaining weight, one could experience a minor degree of time dilation. It's essential to emphasize that this effect would remain negligible unless we were to approach cosmic scales.