Undigested food in stool

Patient: Sir, From last five months , i felt etreme thirst & then extreme urine. after drinking water ,the colour of my urine is pure colourless, when i drink other fluids then colour of urine is light yellow and second thing that last two months, i saw undigested food in my stool just like green leaves,tomatto, spinach . i checked diabities test like pp.fasting, hbiac ,but it is normal . i think that someting is going very bad in my body,please help

Symptoms: Extreme thirst, urine ,undigested food in stool

Doctor: