Food at Potlucks- Am I the only one?

We've been passing on most potlucks for the past few years. For me it's a matter of salt intake and a previous bout of heart failure. I can go to a restaurant, look over the menu and find items that "should" be low salt and gain a pound in "water weight" by the next morning. Where when we go to a potluck, I try to do the same going down the food line with very small portions and eat very little compared to many others and gain up to 4 pounds overnight due to the salt in the foods brought in. We skipped both our park "dinners" due to my dietary concerns and my father-in-law's mobility problems. We prepared Thanksgiving and Christmas dinner this year for my in-laws here at our park in Texas and ate in our Texas room.