The main objectives of this project are (1) to characterize the effects of single dose and made repeated consumption of orange juice on vascular protection and the immune response and (2) to assess the specific role of polyphenols present in citrus fruits in this protection. To do this the investigators will conduct a clinical study, randomized and crossover, among healthy men 50 to 65 years that are slightly overweight. These volunteers, who continue to follow their usual diet, should consume daily for 4 weeks (1) orange juice or (2) an isocaloric control beverage or (3) the same drink spiked with a dose of polyphenols similar to that given by orange juice.