Front. Psychology · 2017 Mental performance

Beat the afternoon brain fog.

In 2017, a controlled trial had adults practise slow nasal breathing over several weeks. Their sustained attention measurably improved and their cortisol, the stress hormone, dropped. Calm, nasal breathing steadies focus where mouth-breathing leaves you scattered.

More focus, less cortisol. Open the nose and the fog lifts.
Ma X, et al. The effect of diaphragmatic breathing on attention, affect & stress. Front. Psychol. 2017.Breathing-technique research; supports the habit, not a strip trial.
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