Hi
If your trip back in time, involves going along the Yangtze river, to the more remote locations then I would recommend getting the usual precautions - check with GP with the up to date recommendations.
Um, apart from that you might want some shoulder pads to defend yourself against the hordes of Chinese tourists who use their elbows freely, and you can get through a lot of sticky rice so perhaps take a softener with you.
But really (i'm not joking about the elbows) the only issue you should have is tiredness adjusting to the time difference. but once you get over that you should be fine.
Chris