Adding walnuts and walnut oil to your daily diet can help your body deal with stress. Researchers found that the poly-unsaturated fats in walnuts influence blood pressure, at rest and during stressful situations. Several studies showed omega-3 fatty acids (eg alpha linolenic acid found in walnuts and flaxseed) can reduce LDL cholesterol level. For people suffering from hypertension and high cholesterol, getting lots of exercise and making some adjustments in your diet can significantly change your cardiovascular health. You can easily add walnut oil and flaxseed to many meals or use them as substitutes for other types of oils in many recipes.