Decrease in body weight may be caused due to
Diabetes or
thyroid problem, it would be better if you can get you thyroid profile done and also get your blood
sugar level done. Beside this your weight can ales decrease if you are going through lot of stress or depression.
Next Steps
I would suggest you that besides a healthy diet do meditation as well.
Health Tips
Please consult with your nearest homoeopathic doctor, or you can consult with me online if you like. Take care.