We’re constantly gathering at home with my friend group. But everyone always shows up with junk food. Sugary drinks, chips… I’m trying to eat healthily, and this has started to bother me. I asked once, but I felt like they didn’t take me seriously. I’m not sure how to bring this up again. I don’t want to hurt their feelings, but I also want to maintain my own routine at home. What do you think, should I talk openly about it?
I think you should just speak directly. Say, “Guys, I’m trying to eat healthily, I don’t want this much junk food at home.” Be clear about it, and if someone gets upset, then so be it. 
You’ve already asked for it once, why are they still bringing it? 
So did you suggest any other alternatives to them? For example, did you say something like “bring fruit”?
I actually said it before @kahvebitmeden, I asked to bring nuts, fruits, and such, but there weren’t really many who cared.
@aklimkaldi I don’t think you’re being clear. It shouldn’t be a request — you need to set rules. This is your home, after all, so you need to be firm.
I experienced the same thing. At home gatherings, for a while everyone brought fast food, and then I said, “You guys are eating, I’m getting cleaned up,” and I acted a bit spoiled. The crowd immediately gathered themselves.
As a host, you’re right here, but if your friend group is so careless, I suggest you think about why you’re still doing this. It seems the problem isn’t the junk food.
This is actually more of a personal boundary issue. Your home is your space, and it needs to be respected. The host’s rules should always take priority when being a guest. Maybe you can try to communicate more clearly one more time.