Sailing ship at the dock

Julie quietly ate the meal that was specifically bought for her. While taking a bite from the sandwich, she noticed how everyone at the table was quiet. Roman hadn't spoken a word, but he did continue to sit next to her. Her friends, who had returned to the table, had been surprised seeing Roman sitting at the table. 

Leaning towards Roman, Julie asked him, "Your friends aren't going to wait for you?" 

Roman, who was sipping the coke, turned his gaze to look at her. He had one of his hands pulled back to rest on the chair like the delinquent he was. 

"They know why I am here," responded Roman nonchalant, but his attention was on her. "I am sure they will survive without me."

"You aren't eating anything," Julie pointed out, realizing how he barely ate anything except the chips and coke. How did he maintain his body eating and drinking that? She asked in her mind. "Research says that having coke all the time is not healthy."