did your parents immigrate here? If they did, they probably didn't have as must food as you and didn't reach their full height potential. I notice immigrants' sons usually have at least 3-4 inches on their father at the very least.
Yeah, they immigrated to the US from Pakistan back in the 70's before any of us were born...interesting theory.
It's mostly genetics now that nutrition is readily available. I remember reading how they took an X-ray of Yao Ming's hand or feet around 7 years old to predict how tall he'll grow. My mom is 5 feet and my dad is 5'6. I was 5'6 at 8th grade, and I grew a couple of inches in highschool.
I think height is a mixture of both nature and nurture. Even if you were the love child of Yao and that 7' Chinese center for the LA Sparks without plenty of protein and calcium in your diet you probably aren't gonna be bigger than Earl Boykins.
height is definitely a mix of genes. i have a twin sister who is a full 3 inches taller than me. lemme tell ya....it sux!! i stopped growing in 8th grade and i'm at 5'4". my sister stopped growing freshman yr of college and is 5'7". my mom us 5'3" and my dad is 5'10" but we're Chinese. 3/4 of my grandparents were under 5'5" so i blame them.