Final answer:
The deficiency causing difficulty in digesting fatty foods is the lack of bile, which is crucial for breaking down fats.
Explanation:
The deficiency causing a client to have difficulty digesting fatty foods is a lack of bile. Bile is essential for emulsifying fats into smaller molecules that can be digested by lipase. Without enough bile, the process of breaking down fats into absorbable components is compromised, leading to digestion issues.
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