When we breathe deeply and regularly with our nose, we becomes more alert brain of oxygen. Fat also need oxygen to be burned so just win - win to breathe through the nose.
When we breath deeply, the diaphragm moves up and down and then rub while liver , stomach and intestines . This affects the digestive process positively. Even the heart gets massage and helps the blood flow to come back. Following that reduce varicose veins and obtain a stable blood pressure . Aahh what I'm going deep breathing regularly now . No more varicose veins to me thanks !
The persons
who sleeps with his mouth closed wakes also more rested and heals and recovers therefore better.
Think about this and try to take control of your breathing.
Good luck