Hi welcome to HCM I have gone thru your query regarding eating disorders . Your doctors, after general check up of your blood etc. advised you that kidneys don t look very good because you are dehydrated and have a bad d ehydrated and have a bad immune system . Dear , It is a matter of concern and for your info , your eating disorer and fauty life style is responsible for all this . I would like to suggest you to modify your food habits and life style , Don t skip your meals . Have diet including all essential nutrients - fiber ,vitamins , minerals and antioxidants in natural form and lot of water . Cucumber ,watermelon and other watery foods . Potassium in bananas helps rehydrate you better than most foods. Try adding 1 teaspoon lime juice, a pinch of salt and 1 teaspoon sugar to a pint of water. Sip the beverage throughout the day to cure mild dehydration. To maintain your proper wt proper assimilation of food is important . And for that regular exercise , walk , yoga - pranayam - deep breathiong help detoxifying your system has long been known to promote a strong immune system ,giving resistance from diseases along with Avoid processed foods carbs , sugar , fried ,fast foods , Tea , coffee ,alcohol and smoking , stress and Constipation all will produce biochemical and metabolic conditions in your body that will decrease your immunity, so avoiding is definitely the first step in the right direction to detoxing the body, boosting the immune system . All are the pillers of our strong immune system responsible for healthy disease free life Always remember, In case of any advice, please see your doctor / professional Hope this helps solves your query .Take care .All the best .Get well soon Don t hesitate to come back in case of any further query .