In July 2015 researchers from Brazil published the results of their study to assess the effect of red orange juice, consumed for an 8-week period, on risk factors for metabolic syndrome. Various clinical and laboratory assessments were made at the start and end of the study. Results showed that levels of low-density lipoprotein (bad) cholesterol and C-reactive protein (an inflammatory marker) decreased, while the level of antioxidant activity increased. It was also seen that insulin resistance and systolic blood pressure were reduced in normal-weight individuals, whilst the diastolic blood pressure decreased in overweight individuals.
Silveira JQ et al. Red-fleshed sweet orange juice improves the risk factors for metabolic syndrome. Int J Food Sci Nutr. 2015;66(7):830-6