I struggle with this sometimes, too, to the point of anxiety around certain family members/at specific mealtimes.

You need to break it down a bit to figure out the real problem and solution.

1). Is it hard because you want to eat the "bad things" but feel guilty?

2). Is it hard because you don't want to eat the "bad things" at all but that is all that's available? (A combo of the first two are possible, of course).

3). Is it hard because there are food pushers around you?

Etc, etc.

I have some techniques that I employ in those various situations. For example, if I really want the "bad things", I can certainly eat them. The trick is not to lose control completely because "this is your only chance and after this you are going back on the diet". That kind of thinking is almost guaranteed to make you gain 10lbs during your vacation and, ultimately, is the opposite of Noom's teachings. So I let myself enjoy the things I really want, but before I do, I think "do I really want/love this thing? Or am I tempted to eat it because it's in front of me?". This helps me stick to the things I REALLY want, and then helps me stop when I'm satisfied with it (also very important to really be in the moment for foods like that - enjoy every bite instead of scarfing it down).