 [ Symptoms ] my friend has immunodeficiency can not eat doctors say depression any advice [ Disease ] she must be having an upper git problem like reflux esophagitis and or gastritis being vegetarian sometimes causes low immunity as the body misses some important proteins and minerals she can stay on juices and avoid caffeine smoking citrus juices and fats she would better go for upper git endoscopy to discover the issue stress and depression also causes her not to eat and no eating causes depression break the vicious cycle exercise yoga and relaxation is good for her