<s>[INST] i am a 15 year old boy and as it is the month of ramadan, i have been fasting. it has now been 2 weeks of fasting and i have lost about 4kg. also i used to look more muscly but now not as much. Is there something that i can do to gain back muscle? I fast from 3am to 9.30pm [/INST] Dear patient You have to take lots of proteins to build and maintain  muscle mass. If  you are allowed to eat after 9 pm then take lot of meat and chicken in your diet. Also take sufficient carbohydrate  in diet so that muscle protein is not utilised to gain energy. Make chart of daily requirements  and food intake  to balance  your body needs. You can also take help from nutritionist to make diet chart. All the best. </s>