To translate that little bit of Chinese at 6:51, the interviewer is explaining to audiences that Dan is a bit allergic to flour (which, is that true?), so only Luke will be eating today.
Carmen Chiem Ah. Well, there are very very few Chinese people allergic to that (and even fewer who knew being allergic to gluten is a thing), so I guess the interviewer simplified it as "allergic to flour".
When he was on Downton Abbey he had more weight but he said he wasn’t eating the best or working out much when he was on there but after he moved to Brooklyn he started eating better and now goes to the gym everyday,that’s probably why.