Studies

Cognitive and Emotional Benefits:

A study published in The Journal of Neuroscience showed that nasal breathing influences brain regions like the amygdala and hippocampus, which are tied to emotion and memory. This indicates that breathing through the nose can enhance cognitive functions and emotional regulation

https://www.jneurosci.org/content/36/49/12448

Enhanced Oxygen Absorption and Nitric Oxide Production:

Nasal breathing allows for deeper, slower breaths, improving oxygen intake and energy levels. Additionally, the nasal passages release nitric oxide, which improves blood flow, lowers blood pressure, and boosts immune function. Mouth breathing does not offer these benefits

https://www.breatheology.com/why-its-better-to-breathe-through-the-nose/
The Journal of Neuroscience

Improved Sleep and Respiratory Health:

Nasal breathing reduces snoring, sleep apnea, and dry mouth, leading to better sleep quality. It also filters and humidifies the air, reducing exposure to harmful pathogens, thus supporting respiratory health

https://www.breatheology.com/why-its-better-to-breathe-through-the-nose/

Athletic Performance:

Research shows that nasal breathing enhances oxygen efficiency and endurance, making it beneficial for athletes. By maintaining proper oxygen and carbon dioxide balance, nasal breathing can increase stamina and reduce fatigue during physical activities