Medical nutrition therapy (MNT) provided by a Registered Dietitian lowers blood pressure in adults with hypertension. Three studies regarding the effectiveness of medical nutrition therapy for under six months reported significant reductions in blood pressure of approximately five mm Hg for both systolic and diastolic blood pressure. Five studies regarding the effectiveness of MNT from six to twelve months reported similar significant reductions in blood pressure. Five studies report sustained reductions in blood pressure beyond one year. In these studies, both individual and group sessions were employed over an average of nine sessions.    

• Grade I means there is Good/Strong evidence supporting the statement;
• Grade II is Fair;
• Grade III is Limited/Weak;
• Grade IV is Expert Opinion Only;
• Grade V is Not Assignable.
• High (A) means we are very confident that the true effect lies close to that of the estimate of the effect;
• Moderate (B) means we are moderately confident in the effect estimate;
• Low (C) means our confidence in the effect estimate is limited;
• Very Low (D) means we have very little confidence in the effect estimate.
• Ungraded means a grade is not assignable.