A daily glass of pure orange juice could help control blood pressure, reduce inflammation, and improve heart health, according to a growing body of research. Scientists have found that regular consumption of the drink influences the activity of thousands of genes in immune cells, many of which are involved in regulating blood pressure, inflammation, and sugar metabolism.
In a recent study, adults who drank 500ml of pure pasteurised orange juice every day for two months showed reduced activity in genes linked to inflammation and high blood pressure, including NAMPT, IL6, IL1B, and NLRP3. Another gene, SGK1, which affects the kidneys' ability to retain sodium, also became less active. These changes align with previous findings that daily orange juice consumption can lower blood pressure in young adults.
Natural compounds in oranges, particularly the flavonoid hesperidin, are thought to drive these effects. The response varies by body size: overweight individuals showed greater changes in genes related to fat metabolism, while leaner volunteers had stronger effects on inflammation. A systematic review of 15 trials involving 639 participants found that regular orange juice consumption reduced insulin resistance and blood cholesterol levels.
Additional research focusing on overweight and obese adults reported small reductions in systolic blood pressure and increases in HDL (good) cholesterol after several weeks of daily juice consumption. Another study found that drinking blood orange juice for a month increased gut bacteria that produce short-chain fatty acids, which help maintain healthy blood pressure and reduce inflammation.
People with metabolic syndrome may see particular benefits. In one study, daily orange juice improved endothelial function—how well blood vessels relax and widen—in 68 obese participants. Better endothelial function is associated with a lower risk of heart attacks. While not all studies report identical outcomes, the evidence challenges the notion that citrus juice is merely sugary water. Whole fruit remains the better choice due to its fibre content, but a modest daily glass of pure orange juice appears to offer measurable health benefits.
