My bf always eats too much, like 3-4 servings at family dinners and I don't know how to tell him that he's coming off as a bit selfish and glutton.

My family (7 people with me) hasn't complained but I was raised being told that you should always hold back on food so that everyone can eat or at least have a taste. We're kinda poor :/

My bf lives alone with his mom and food hasn't been a big issue but his mom does call him chubby (he is a bit chubby but no biggie) and joke about his weight. I really don't want to make him more self conscious than he already is but I want us to be more healthy.

We're also planning a trip to my home country and my family back there isn't exactly rich :/ . I guess that I'm just worried that he'll eat too much and that we won't have enough food for everyone.

How do I tell him to slow down on food without hurting him?