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OMFG! What's that rank stench. How can anyone smell like this?
Yes, bad breath that bad comes from the stomach. He is not digesting his food properly, and it's an indicator of bigger troubles ahead.
He needs to masticate his meat, (also eat less of it), and drink plenty of water.
As he's a bloke, he probably won't listen to this well meant health advice. Just tell him that his breath fucking stinks and that it makes you feel sick ... and tell him that his work colleagues can obviously smell it too.