DefinitionAppetite is the desire to eat. A decreased appetite is when you have a reduced desire to eat. This occurs despite the body's basic caloric (energy) needs.Alternative NamesLoss of appetite; Decreased appetiteConsiderationsAny illness can affect a previously hearty appetite. If the illness is treatable, the appetite should return when the condition is cured.Loss of appetite can cause unintentional weight loss.Depression in the elderly is a common cause of weight loss that is not explained by other factors.Common CausesAnorexia nervosaCancerChronic liver diseaseChronic kidney failureEmotional upset, nervousness, loneliness, boredom, tension, anxiety, loss, and depressionHIVHypothyroidismInfectionsMedications and street drugs AmphetaminesAntibioticsChemotherapy drugsCodeineCough and