The benefits of Meditation are manifold. Most physical afflictions, i.e., almost over 99%, are psychosomatic in nature, i.e., born in mind and later manifested in the physical. They arise because of mental worries; and all mental worries are because of a certain lack of clarity in analysis and thinking and consequent intellectual immaturity; this intellectual immaturity is due to a lack of basic spiritual knowledge.
And, spiritual knowledge is obtained only through Meditation - by having out-of-body experiences. Our practical, Meditational Spiritual knowledge is further strengthened by studying all the existing literature in the field of Spiritual Science, wherein the experiences of meditations are astral travelers etc., are given in great detail.
In short,
A spiritually illumined person knows all the causes and, thus, all the corresponding effects -and has no worries; therefore, he/she becomes totally free of all physical afflictions in due course.
In Meditation, one's energy is increased through in-flow of energy from cosmic energy sources; new information about alternate realities is obtained; and, consequently, there is a constant expansion of consciousness.