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Not only because it makes you get less sleep or take worse care of yourselves, excess caffeine will change the intestinal flora of your body,The intestinal flora will become a barrier which can protect human beings from pathogenic bacteria, which will affect your immune system. That's what I learn form metagenomics.
The intestinal flora plays an important role in your body, you should be really careful for what you have take.
Finally, take care of yourselves!