Food yellow fever syndrome - symptoms and diet

Hepatitis A is an infectious liver disease caused by the Hepatitis A Virus (HAV), which exhibits resistance to external factors such as temperature or chemical agents. The sole reservoir of the virus is humans, and transmission primarily occurs through contaminated food. Infection can be contracted via: direct contact with an infected individual (e.g., inadequate hygiene after using the toilet), consumption of improperly processed food (e.g., unwashed fruits), ingestion of contaminated water (including ice cubes), occupational exposure to children in daycare settings, or handling municipal waste without proper hygiene measures. Laboratory analyses confirm that HAV is excreted in feces 1–2 weeks before clinical symptoms manifest and continues for up to a week afterward. The condition should not be trivialized, as liver cell damage occurs even in the early stages. Due to the possibility of asymptomatic cases or symptoms resembling other hepatitis types, the definitive diagnostic criterion is the detection of IgM anti-HAV antibodies in the blood serum. In some instances, supplementary tests such as liver enzyme activity assessments (ALT, AST, GGTP) or liver biopsy (primarily in ambiguous cases) are employed to support the diagnosis.

The incubation period for food-induced jaundice typically ranges from 15 to 50 days, during which the condition may initially progress without noticeable symptoms. The patient's age significantly influences the course of the disease. In children (up to 6 years old), hepatitis A often manifests either asymptomatically or in a mild form. However, characteristic clinical signs are more commonly observed in adults. These include flu-like symptoms such as headaches, joint pain, and fever; dermatological symptoms like itching, jaundice of the skin, and occasionally of the mucous membranes and sclera; and gastrointestinal symptoms such as nausea, vomiting, diarrhea, clay-colored stools, and dark urine. Notably, recovering from the illness provides lasting immunity against reinfection by the virus.

Currently, there is no specific treatment to neutralize the HAV virus, so the management of the disease primarily focuses on maintaining proper daily hygiene practices. This includes limiting excessive physical activity during illness, ensuring adequate rest, and adhering to a suitable diet. When preparing meals, it is important to select foods that do not place unnecessary strain on the liver. Therefore, the diet should be easily digestible, balanced, and meet the body's daily energy requirements. During periods of worsening symptoms, patients often exhibit reduced fat tolerance, so it is advisable to derive approximately 70% of energy from carbohydrates, 10–20% from fats, and 10% from proteins, gradually adjusting these proportions based on individual tolerance. A return to a normal diet (in cases of typical disease progression) should generally occur within about six months. Sources of carbohydrates include light bread, whole-grain bread, fine cereals, boiled potatoes, small pasta varieties, berries, bananas, apples, and peaches. Recommended vegetables are zucchini, green beans, salads, peeled tomatoes, carrots, and beets. Protein should come from lean meats (beef, poultry, veal, rabbit), lean fish (cod, pollock, perch, pike), low-fat dairy (cottage cheese, yogurt, kefir, milk), and eggs (or egg whites, depending on tolerance). Due to the restricted fat intake, fats should only serve as additions to meals (e.g., to prepared dishes). Recommended options include plant-based oils such as olive oil, rapeseed oil, flaxseed oil, and MCT oil.