hmm, well, lowfat buttermilk has about 2 gr. of fat in a cup; that's fewer calories and less fat than 2% (reduced fat) milk. (li think lowfat buttermilk is typically available in supermarkets).
if you want less fat than that, i was going to suggest adding about a tsp. of lemon juice or vinegar to skim milk, but I think non-fat yogurt might be a better option.
since you mentioned lower-fat, another possibility would be to replace some or all of the butter / oil / fat ingredient with applesauce.
Edited by: ZABOKA at: 7/13/2013 (13:26)