Corrections
A chart on Feb. 8 with the Personal Health column, about nuts, misstated the allergenic risk of nut oils. Most nut oil refined in the United States is free of protein, the allergen in nuts, and therefore does not cause problems for people with nut allergies. But oil extracted by certain methods, like the cold-pressed process, may still contain protein and can indeed pose a risk. Information is available from the Food Allergy Network at www.foodallergy.org or  (703) 691-3179.