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Avocado

Rich in monounsaturated fats, avocado is also high in carnitine and potassium. Potassium-rich avocados can lower “bad” LDL cholesterol levels and they can also lower blood pressure. Avocados are low in sodium, which can raise blood pressure. 

Berries

Berries are well-known for being rich in antioxidants, including anthocyanin. Anthocyanin is especially beneficial to your heart, as it can prevent arteries from stiffening. It also helps your body to release nitric oxide to lower your blood pressure.

Dark Chocolate

Dark chocolate, a healthier alternative to milk chocolate, can improve blood flow when you eat chocolate that has at least 85 percent cocoa. The polyphenols in dark chocolate are said to reduce oxidative stress and help the body form more nitric oxide, which helps the blood vessels dilate and increase blood flow.

Fish

Heart healthy fish like salmon, mackerel, trout, herring, and halibut are full of omega-3 fatty acids, which are helpful in improving your blood circulation. Eating fish regularly has many benefits, including lowering your resting blood pressure and keeping your arteries unclogged. A diet that includes fish has also been shown in studies to lower your risk of heart attack, atherosclerosis, and arrhythmia (an irregular heartbeat).  

Green Tea

Tea is known for having a healthy effect on the heart and is associated with a decreased cardiovascular risk. Additionally, a study found that green tea rapidly improves the endothelial function of the circulatory system. Endothelial dysfunction on the other hand, precedes atherosclerosis, a thickening and hardening of the arterial walls, which could potentially cause a stroke or heart attack.

Onion

Onion is rich in quercetin, a strong antioxidant flavonoid that reduces the risk of cardiovascular events. Because of this fact, a study found that having onion daily can increase blood flow. Another study discovered that habitual consumption of allium vegetables (garlic and onion) led to a 64 percent reduced incidence of cardiovascular disease.

Pomegranates

Pomegranate seeds are packed with nutrients, primarily heart-healthy polyphenols, tannins, and anthocyanins, which are antioxidants. These may help prevent atherosclerosis, or hardening of the arteries, according to a study. Additionally, drinking pomegranate juice daily was shown to improve blood flow to the heart in patients with heart disease. 

Tomato

Tomatoes are high in carotenoids such as lycopene, beta carotene, and vitamin E, which are effective antioxidants that can reduce blood pressure, improve blood flow, and slow the progression of atherosclerosis.

Watermelon

A quintessential summer fruit, watermelon is a low calorie, high-fiber snack. A study by The Florida State University suggests that watermelon can help fight prehypertension, a precursor to cardiovascular disease. Watermelon is one of the highest sources of L-citrulline, which can slow or weaken the increase in aortic blood pressure, according to the study.