[header] How to prevent low blood pressure [title] Add more sodium to your diet. [step] Adding a pinch of salt to soups and potatoes adds flavor and increases blood pressure. Topping a stir-fry or rice with soy sauce has the same effect; however, be careful when adding sodium to your diet. 
The amount of sodium you need depends on your body, age, and gender. Talk to your doctor or a trained nutritionist before adjusting the sodium content of your diet.