High crude-oil prices and Federal biofuel-use mandates have led to increased biodiesel production in the past decade. About a quarter of soybean-oil use goes to biodiesel production, and about half of U.S. biodiesel output uses soybean oil as an input. Food usage is the primary use of soybean oil, although a decline from 2004/05 on reflects concerns about trans fatty acids, which are created when vegetable oils are hydrogenated.
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