I've put away (and still can) 3/4 of a large Papa John's pizza. Do I....no! While we are all concerned and enthusiastic about what we put into our bodies....those who choose not to care we can't control them.
We've learned portion control, she has not.
I've tried not to judge people by what and how they eat.
I've go a skinny friend (5'5" and 110 pounds) who eats a whole large pizza along with drinking beer to wash it down. The pizza is her only food vice.
Watch, don't judge and remember how much better you feel now that you know how to eat better.