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You have not mentioned you bowel habits. You could be suffering from TB of the intestine or a possible malignancy, but nothing can be said unless you get a full workup. TB is known to cause weight loss
, night sweats
. Do get worked up for this. You need to eat a diet rich in proteins
like pulses, cereals, eggs, chicken, lean meat, soyabean. Eat plenty of fresh fruits and vegetables. Drink plenty of water as well for proper bowel motion.