Dairy manager Denny Anderson stocks Land O'Lakes butter at Lunds & Byerlys in Edina on Monday. Butter consumption in the U.S. is increasing. (Ayrton Breckenridge/The Minnesota Star Tribune) ...

One pat of butter and one tablespoon of cream each contain about half a gram of lactose or less. Many supermarkets carry lactose-free dairy products like milk, cheese, yogurt and ice cream.

Farmers often sell milk at a federally mandated price to producers who process it into fluid milk, butter, cheese or other dairy products. Around 15 cents of every retail dollar go to farms ...