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The suffix -phagia is derived from the Greek word "phagein," which means "to eat" or "to swallow." In medical terminology, it specifically refers to the act of swallowing or the intake of food. When this suffix is used, it often appears in words that describe specific swallowing conditions or disorders, such as dysphagia, which refers to difficulty swallowing. This makes -phagia the correct suffix in the context of this question.

The other suffixes have different meanings: -sthesia relates to sensation or perception, -trophy refers to nourishment or growth, and -emia pertains to blood conditions. Thus, it is the specific definition of -phagia that clearly identifies it as the suffix associated with the act of swallowing.