athletic as a young man, insists his health is still good. >> if you talk to anybody in the room that's struggled with their weight -- >> reporter: he insists his health is still good, but he's aware his weight could become a serious issue, and that he has a plan to deal with it. when you look at him, do you think he's a ticking time bomb? >> i think it's really very judgmental to have such a strong conviction when you have no innate knowledge of his level of activity, his left of fitness. >> reporter: but dr. mariano said it is sad the governor cannot take my advice and instead chose to attack me personally. probably not going to fly with christie, who has now made it very clear that he has no patience for people who speculate about his health before having all the facts. >> until that time, she should shut up. >> reporter: dan harris, abc news. >> i agree with the governor. he's not running for national office just yet. he said he's battling his weight issue. it's his issue.