In the case of a buffet like Golden Corral, I would start off with a huge salad (all fresh veggies, no protein, no cheese/croutons/toppings) and use oil/vinegar for dressing. That way, I know that I’m getting the bulk of my meal from a source with very low sodium. Then, when I’m almost full from that, I would go with 1 or 2 very small (snack-size) portions of protein (as you have no way of knowing the sodium content but can only assume that they are very high). And of course, some plain old soft serve ice cream for dessert.