Decreased appetite can result from a wide range of physical, psychological, and lifestyle factors. Common causes include infections, chronic illnesses, hormonal imbalances, and gastrointestinal disorders, which can alter hunger signals. Medications, including antibiotics and pain relievers, may suppress appetite as a side effect. Mental health conditions such as stress, anxiety, and depression also play a significant role. Poor sleep, dehydration, and aging can further reduce hunger cues. In clinical settings, healthcare providers, pharmaceutical manufacturers, and even a cephalexin capsules supplier must consider appetite changes when evaluating treatment outcomes, as nutrition directly affects recovery and overall health.