I was very ill during my first pregnancy with an upper respiratory infection...complication from allergies ...and asthmatic bronchitis. I gained 80 lbs, and have tried everything to lose it. I was always able to lose weight quickly and easily before then, and was very thin and athletic . Now even with diet and excercise equal to what I used to do, and more so ..I have not been able to lose, and have gained more over the years..even when dieting! My son also has trouble with his weight, and gains very easily. If it was a virus during my pregnancy with him, than that could explain his problem as well. His 2 sisters are quite thin, and though only slightly younger, they eat as much as he does, without the weight gain.