Lifestyle

4-7-8 breathing

A diaphragmatic breathing technique popularized by Andrew Weil, based on pranayama. Cycle: inhale 4 s through the nose, hold 7 s, exhale 8 s through the mouth. Prolonging the exhalation stimulates the vagus nerve and activates the parasympathetic rest state.

In practice

4 full cycles (about 76 seconds) twice a day for at least 4 weeks. Ideal before sleep and in moments of acute anxiety. Afterward you can move on to 8 cycles per session.

Precautions

Very safe. It may cause dizziness in the first sessions due to hypocapnia; sit down. Do not force the breath hold in advanced pregnancy, severe COPD, or uncontrolled hypertension.

Effect by goal · level of evidence

Acute anxiety

improves Moderate RCT (AA)

Acute effect

Randomized trial in post-bariatric surgery patients: significantly reduces state anxiety (STAI) vs standard breathing. Acute effect after 1–2 sessions.

View the study (RCT) →

Anticipatory / preoperative anxiety

improves Moderate RCT (AA)

Effective acute use

Applied 5–10 minutes before procedures: reduces state anxiety, reflex tachycardia, and pain perception.

View the study (RCT) →

Sleep-onset insomnia

improves Low-moderate small RCT (A)

Improves latency

Reduces sleep latency and the frequency of night awakenings in primary insomnia, with an effect similar to structured relaxation techniques.

Chronic stress and HPA

improves (modest) Low-moderate narrative review (A)

↑ Vagal tone

Practiced regularly, it stimulates vagal tone (increased HRV) and reduces baseline cortisol. Profile consistent with reduced allostatic load.

Information, not medical advice. Scientific evidence reflects the quality of the studies.