Suggestion: You can eat, but don't eat too much. Polymyositis has poor appetite when it is hot, and taking anti-rheumatic drugs can also cause gastrointestinal reactions. Regardless of diet, give priority to light food, such as noodles, glutinous rice, rice porridge and so on. Eat more fresh fruits and vegetables, drink more cool drinks to quench your thirst and replenish your body fluids.