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Obesity has reached epidemic levels in the United States, and bariatric surgery is becoming an increasingly prevalent intervention. Nurses play an integral role in the care of these patients before, during, and after surgery. Using theory in practice provides a systematic, organized space that promotes a comprehensive yet individualized approach to patient problems. Middle-range theories, such as the theory of experiencing transitions, can easily be used for research and practice development. The theory was described and evaluated for substantive foundations, structural integrity, and functional adequacy. The evaluation demonstrates the use of the theory in nursing practice and research with patients experiencing the transitions associated with bariatric surgery.