Actually, now a days, buttermilk is touted as being "fat free". I have a hard time believing that, but stranger things have been known to happen. Like 1/2 & 1/2 sold as "fat free"....have you ever read those labels??????? Talk about an oxymoron!
I do not drink milk- just have never liked it- but I do use buttermilk for cakes, biscuits, and for soaking chicken- you know there was a show on PBS yesterday and they brined the chicken in buttermilk with salt added for only one hour, and then fried it up.....looked really good.
The dairy that we purchase all our milk etc from (Braum's) actually has a very thick buttermilk and they sell it in both quarts and half gallons. Always have to shake it well before using.