I keep losing weight and i'm 5'4" and i only weigh 105. can you give me advice on how to gain healthy weight back?

Why Are You Losing?: Please first see a doctor to find out why you are losing weight. Have your thyroid, liver function, blood count and blood sugar checked and have a professional review your diet intake to see if you ate getting enough calories. If you are eating enough then you should be checked for malabsorption with a specialized stool test. Good luck.