Although the old adage of too much of anything is not good is subjective in that people differ in how they adapt to situations, as humans, too much of anything for anyone can cause big changes in the mind/body systems. The mind/brain will try to adapt to the stimulus at hand, and if that stimulus is particular and repeated often and for extended periods, then the mind/brain will dedicate itself to performing that particular task or responding to the stimulus. The brain will actually rewire itself. Brain cell will grow in the required areas but the brain will also allow brain cells to not be replaced in unused areas, effectively killing off or dimishing abilities.
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