The thing is celebs don't quietly lose weight then say an embarrassed thank you when someone notices..
They have to do it all guns blazing, rip off their clothes, clamber breathlessly into a thong bikini, slippery with baby oil and stinking of fake tan and pose "provocatively" for a tabloid under a headline screaming how much weight they have lost and what a generally wonderful new outlook on life being thin has given them and we are supposed to look at them and think how wonderful they are for being thin. Not how talented,kind etc they might be, but how terrifically THIN they are
Normal people just lose weight, buy some new clothes and feel proud of themselves.