World War I - Why Use Other Fats Than Butter in Cooking Poster

Why use other fats in cooking poster. From Graphic Exhibits on Food Conservation at Fairs and Expositions.
Identifier
NYSA_A4237-78_B2F4_30
Date Original
September 1 1917
Language
English
Source
New York State Archives, New York State Defense Council. Correspondence with National Council of Defense, 1917-1918. Series A4237-78, Box 2, Folder 4, page 30..
Rights
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Geographic Locations

New York