This is such an interesting question! And the responses are so helpful. Thanks!

Btw you can try chanting Om in evening after a stressful and tough day and when you sit down in calm area and chant om properly or even if you quitely listen to the chants keeping your brain empty for awhile, you'll surely sense some difference.

Well my saying on this is, yes mantra chanting does effect our body. Imagine how music makes our mind calm! Same when the mantras are pronounced appropriately those certain vibrations and sound frequency effect our body. Like have you heard about binaural beats? Aren't they helpful and approved by science? In same way the meaning of words in Sanskrit mantras and the frequency generated by them does makes several benefits to us. You can trust my saying if you want and research on them. I'm a science student btw.

Great question. I’d love to know more about this too. I always assumed it was a combination of the vibrations and the meditative state chanting can put you in.