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The flowchart of the study design. The study protocol was approved by the Ethics Committee. During a 7-day washout period, the participants were required to abstain from extra virgin olive oil and food supplements containing polyphenols. The nutritional intervention consisted of the consumption of the Oliphenolia® dietary supplement preparation (25 mL) twice a day, 30 min before the main meals (lunch and dinner), for 30 days, with no other restriction from the usual diet.
