Growing up in a dairy state, we learned all about milk fat, cheese production and calcium in primary school. We did not learn about gourmet cheeses (yellow and non-yellow was the limit back then, really) but even as fifth graders, we knew that whole milk was about 4 percent fat, and that skim was not really fat free, even though it looked blue.
With friends coming for a casual dinner on Saturday night, my young assistant and I made up a batch of Italian cornmeal cookies. The amount of butter worked out to about a half-tablespoon per cookie, so they they were definitely not health food. But the scratchy presence of the cornmeal added fiber, making their texture more interesting than shortbread or plain butter cookies. The liberal use of lemon zest also lightened them up. Dusted with baker's sugar, embedded with pine nuts, and optionally dunked in Cointreau or Vin Santo, they were, if I say so myself, just the thing in front of a big fire on a damp late winter's night.
I have noticed that the recipes in most fashionable cookbooks these days call for unsalted butter. The reasoning is that the salt content can vary among brands or countries, and that with unsalted butter the cook can control the amount of salt completely. Being no control freak myself, I have rejected unsalted butter as unnecessary in my kitchen. Unsalted butter tastes terrible on its own, and adds nothing to the taste of a slice of toasted bread -- without a bit of salt, it's just fatty milk. Salted butter does not contain enough salt to make a difference either way. So I've made it a rule to keep salted butter and margarine in the house. Margarine is for my fellow householders who watch their dairy intake, and butter is for baking. Both taste good on toast.