Should I say something

So I have a friend and we work together..I am 5 months and she is 4 months..but she is really overweight..and everyone makes fun of her because she eats ALOT and UNHEALTHY stuff all day..sometimes I feel like I should say something to her about all the unhealthy things she eats but other times I'm like it's not my business..I just want her baby to be okay..what should I do??