Lifestyle

Prolonged overnight fasting (≥13 h)

Lifestyle.

In practice

It depends on the case; there is no single guideline.

Effect by goal · level of evidence

Breast cancer prognosis

association Low-moderate study (A)

36%

In 2,413 women with early breast cancer, fasting less than 13 h per night was associated with more relapses (those who fasted ≥13 h had ~36% lower risk of recurrence), along with better blood sugar (HbA1c) and sleep. Observational association, cause not proven.

View the study (study) →

In depth

Lifestyle · Highest evidence: Low-moderate · 1 finding

Findings

Breast cancer prognosis — association (Low-moderate, study). In 2,413 women with early breast cancer, fasting less than 13 h per night was associated with more recurrences (those who fasted ≥13 h had ~36% lower risk of recurrence), along with better blood sugar (HbA1c) and sleep. Observational association, causation not proven. 27032109

Information, not medical advice. Prescription drugs require a doctor.

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