São Paulo: Drinking orange juice regularly may influence biological pathways linked to inflammation, blood pressure and metabolism, according to research published in Molecular Nutrition & Food Research. The findings offer fresh insights into how citrus flavonoids may affect the body’s molecular processes.
Study finds changes in gene activity
Researchers studied 20 healthy adults who consumed 500 ml of orange juice daily for 60 days. Blood samples were analysed to examine changes in gene expression in peripheral blood mononuclear cells, which are part of the immune system.
The researchers identified 1,705 coding genes whose activity changed following regular orange juice consumption. Several were associated with pathways involved in inflammation, blood pressure regulation, lipid metabolism and insulin-related processes.
The study also found that responses differed according to participants’ body weight, suggesting that the effects of orange juice may not be identical for everyone.
Promising findings need context
The researchers reported that earlier work in the same study found reductions in blood pressure and body fat percentage following 60 days of orange juice consumption. However, the molecular findings do not establish that drinking orange juice will prevent or treat high blood pressure, high cholesterol or other diseases.
The study was also relatively small, with only 20 participants included in the gene-expression analysis, so larger studies are needed to understand the long-term effects.
Whole fruit remains an important choice
While orange juice can provide citrus flavonoids and other nutrients, portion size matters because juice contains calories and naturally occurring sugars without the fibre found in a whole orange.
The American Heart Association’s 2026 dietary guidance recommends eating a wide variety of fruits and vegetables and choosing minimally processed foods. Recent research has also found that higher fruit-juice consumption was associated with greater long-term high blood pressure risk, while replacing juice with whole fruit was associated with a lower risk.
The findings therefore suggest that orange juice can be part of a balanced diet, but it should not be viewed as a cure or substitute for medical treatment.