The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
In general nasal breathing is better. It scrubs the air of bacteria and viruses. You have a microbiome in your nose that benefits. There are a number of reasons, it's also just a more efficient system believe it or not, even though it feels like you can gulp more air with your mouth.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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So, this is a reminder that whenever possible, unless eating or speaking, you want to be nasal breathing, not breathing through your mouth. Your nose is a much better filter for viruses and bacteria than is your mouth.
But I want to mention that this is a bidirectional effect, meaning people who deliberately breathe through their nose tend to get fewer colds and flus. Also people who tend to breathe through their mouth more tend to get more colds and flus.
But nasal breathing whenever possible day and night time is extremely important for encouraging the overall health and resistance of your respiratory pathways to incoming cold and flu and other types of viruses.