There’s good news and bad news here, though overall it seems the scales tip in lard’s direction. Calorie-wise, lard has more of them, about 15% more, which makes a lot of sense when you consider that butter is about 15% water. Compositionally, though, there are certain factors that make lard more desirable, at least based on the (ehem) current thinking of many researchers and nutritionists.
Fat, you see, is not a uniform substance. It’s made up of lipid molecules of many different configurations. As I’ve mentioned many times before, lipids are basically “E”-shaped molecules, consisting of a “backbone” of glycerol and three fatty acids. The fatty acids attached to the backbone are all different from one another, and more than that, vary from molecule to molecule. Where molecules in a fat have similar structures, they will often form solid crystals. Others won’t. It’s this mixture of solids and liquids that gives fats like butter and lard their semi-solid consistency.
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