There are two possibilities for you to lose weight One is that the interview supervisor personally likes to care about others and thinks you are thinner and healthier. The other is that the interview supervisor thinks that being thinner is more helpful to your work.

In fact, no matter whether she advises you to lose weight or not, you can't be sure whether you have been pass, because they will probably have to discuss it before they can decide who to actually recruit.

In addition, euphemistically letting you lose weight seems to be a feeling of greater opportunity. Otherwise, who cares about a stranger? Unless, this person may be a potential subordinate in the future.