It depends on the case; there is no single guideline.
Effect by goal · level of evidence
Cholesterol (management in clinic)
reducesModeratestudy (A)
5-7%
Data from UK lipid clinics (2,508 patients): the cholesterol-lowering diet achieved average LDL reductions of 5-7%, sustained over the long term; in 40% it dropped enough to expect ~25% fewer cardiac events. A real but moderate effect.
Cholesterol (clinic management) — reduces (Moderate, study). Data from UK lipid clinics (2,508 patients): the cholesterol-lowering diet achieved mean LDL reductions of 5-7%, sustained over the long term; in 40% it dropped enough to expect ~25% fewer cardiac events. A real but moderate effect. 9792257
Information, not medical advice. Prescription drugs require a doctor.
Information, not medical advice. Scientific evidence reflects the quality of the studies.