Going to parties can be a challenge when you’re trying to drop a few pounds.
To make it easier, just bring something you can have to share. A snack, an “adult beverage,” whatever…
That way you know what’s in it and that you can have it.
Should you bother the host or hostess about it? Depends… different situations call for different handling. Just don’t make a big deal. Because you probably don’t want to draw attention to yourself and they probably have more important things on their list.
Every diet is different, just like everyone has different sensitivities. By bringing something you can have, your needs are met, someone else may enjoy it and you can forget about the weight loss and enjoy the evening.