Another common symptom is the lack of appetite. Many patients lose a plenty of weight during the period of illness. The Salmonella typhi bacteria makes the person lose the appetite. If you belong to the group of consumers who prefer contaminated food products, you risk experiencing difficulties when having a typhoid fever. Such food often contains these bacteria. This way, a person may lose appetite due to the certain groups of food, which is quite ironical. The thing is these bacteria produce toxins in the stomach.