It depends on the case; there is no single guideline.
Pooled analysis of 6 cohorts (NCI): meeting the recommendation (~150 min/week of moderate activity) was associated with ~31% lower mortality; the benefit keeps growing up to 3–5 times that amount and then levels off, with no apparent harm even at much higher amounts. Observational but very robust.
View the study (study) →Lifestyle · Highest evidence: High · 1 finding
Information, not medical advice. Prescription drugs require a doctor.
Information, not medical advice. Scientific evidence reflects the quality of the studies.