Sour cream has lived out its existence on the junk food list because about 90 percent of its calories are from fat. Oh, and half of that is saturated fat. We live in a world where everything over 40 percent is an abomination. But who wants to eat a dry baked potato?
Here's an easy sour cream substitute: Add a little lemon juice to whipped cream. Let it sit for 30 minutes, then serve. This way you save extra calories and you won't have to run to the store if you're out of sour cream.