hi i need to know if i have thyroid problems. i wALK 4 MILE EACH DAY BUT STILL GAIN WEIGHT. I EAT MINIMAL AND WAS TOLD BY A DIETITIAN . THAT I COULD BE IN A STARVATION MODE. I KEPT A DIARY FOR 3 WEEKS AND WASN'T SO. I NEED TO TAKE OFF 25 POUNDS. I HAVE FATIGUE KIND OF DEPRESSED AS I HAVE CROHN'S DISEASE AND IT WEARS ME OUT . WHY AM I GAINING WEIGHT WHEN EATING SNACKS OF GREEK YOUGART AND POPCORN IN EVENING ONLY EATING 1100 CALORIES. I BELIEVE IT COULD BE THYROID,PLEASE HELP ME.