Changing the Mediterranean diet: effects on blood pressure

Area of Science:

• Cardiovascular Health
• Nutritional Science
• Dietary Interventions

Background:

• Dietary polyunsaturated to saturated fatty acid ratio (P:S) influences blood pressure.
• The effect of increasing saturated fatty acids within a Mediterranean diet on blood pressure is not well understood.

Purpose of the Study:

• To investigate the impact of increased saturated fatty acids on blood pressure in a healthy Mediterranean population.
• To assess the reversibility of blood pressure changes after dietary modification.

Main Methods:

• A controlled dietary intervention study with 57 healthy normotensive volunteers.
• Baseline period (2 weeks) on habitual diet (P:S=0.44), followed by an intervention (6 weeks) with increased saturated fat (P:S=0.23).
• A switch-back period (6 weeks) to habitual diet, with blood pressure and body weight monitored throughout.

Main Results:

• Systolic blood pressure increased significantly in both men (2.6 mmHg) and women (4.8 mmHg) during the intervention.
• A significant linear trend for increasing systolic and diastolic blood pressure was observed over time.
• Blood pressure returned to baseline levels during the switch-back period, with no significant weight change.

Conclusions:

• Modest alterations in dietary saturated fatty acid content and P:S ratio can significantly impact blood pressure in healthy individuals.
• Dietary fat composition plays a crucial role in regulating blood pressure within a Mediterranean dietary pattern.
• Reversibility of blood pressure changes suggests a direct causal link to dietary saturated fat intake.