If you've always had normal systolic blood pressure and no other health issues, but the diastolic is high, it's currently not a sign of a problem--yet. People with elevated diastolic blood pressure often develop elevated systolic blood pressure over time. If you have other cardiovascular risk factors, any elevation in diastolic blood pressure — even if it's small — significantly increases your risk of cardiovascular problems. A diastolic blood pressure above 80 is considered elevated. If you are reading this, it's likely that you're already wondering how to bring it down naturally.
There are some foods correlated with lowering diastolic blood pressure readings that I'll discuss below that may ease this strain on your heart.
Caffeine- (complete list of caffeine containing foods found here)
Salt/sodium- Limit foods that are packaged or preserved or cured with salt or sodium, including:
Sugar- limit some obvious and many sneaky culprits
If your blood pressure routinely creeps above 80 take steps to lower it by quitting smoking, cutting down on salt intake, controlling diabetes, losing weight and keeping your cholesterol levels within normal limits to reduce your risk.
To effectively address your situation, I encourage you to make an appointment with your doctor to assess your elevated diastolic blood pressure and, based on your health history and other medical issues, develop a plan to manage it appropriately.