My husband was slim, trim, and racy when I met him. (I was, too!) He's pretty short (5'7"-ish) and when I met him, he weighed around 170. Now he weighs around 270. He gained all his weight as soon as he retired from the military. I wish he'd lose it because he has other health problems (pre-diabetes, sleep apnea) as a result. Me? I'm really healthy despite the fact that I'm 100+ lbs. overweight. (Seriously. My doctor can't understand how my blood pressure and cholestorol can be so good!
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What about kids? Our son is 6'1" and weighs about 180. He was a bit chubby when he was a young teen, but then he grew a foot overnight and it all evened out. Our daughter struggles with her weight. She was athletic in high school and kept around 170 lbs. (she's 5'6"), but she messed up her knees so badly that she finally had to quit the middle of her senior year. That coupled with her part time job at an ice cream shop put about 30 lbs. on her in just a few months. She managed to not gain the "freshman 15" in college, though, because she walks about five miles a day just getting to places around campus.