Successful substitutions

pdinco

I've had success with the following substitutions:
Kraft olive oil mayo - 20 cal/tsp
Oven joy sandwich bread - 30 cal/slice
Pistachios instead of mixed nuts - 5 cal each

Lourdesong

I picked up some Kraft fat-free mayo last week to give it a try after finding out it's quite popular. 10 calories a tablespoon (16g), and it's pretty good for a creamy condiment, like a less sweet version of Miracle Whip.

Sydking

Laughing cow cheese instead of mayo

Mustard

Full fat Greek yogurt instead of sour cream