I came across this fat replacement...It got great reviews and you can replace half the fat in your tuna salad, salad dressing and it's great for baking....
it says it doesn't alter the taste or texture....
It supposedly is made from all natural bran fiber so not only will you cut calories but you'll gain fiber in the process!...
Check it out.....
http://www.ztrim.com/v2/home.asp