"She developed a weakness for British fare"

Really?

Scarlett Johansson loves British pub food? (that sounds as likely as her showing up at my house and wanting to challenge me in some topless Wii Sports, which Scarlett, if you are up for it, so am I)

The country that hasn't found a meat they couldn't turn into a pudding?

Nobody is saying she looks bad, just that there's a continuity problem with her fluctuating weight on the historical biopic film she's shooting in England.

If anything, she looks better heavier, but since they shoot out of sequence, and since she's so tiny, that kind of stuff can be noticeable.