When I was losing weight, I learned it's salad dressing that adds the calories. That shit has a lot of sugar.
Just about everything at the salad bar is okay. Try to have more green than meat. Cheese should be sparse. Harder cheeses are better than soft (e.g. cheddar is better than blue cheese).
If you need to cut the bitterness in the salad, try a few hits of Tabasco or oil and vinegar mix.
Sugar-free ketchup has artificial sweeteners. I generally don't trust anything that's labelled sugar free because of that.
If you're trying to lose weight, skip the ketchup if you can. Replace it with something not as sugary. If you're using it to dip your fries, well, the fries are going to get you more than the ketchup but even changing out the ketchup for malt vinegar (a la Five Guys) will help.