if you've been introduced to fast food at a young age their body will adapt to it so

[Jenna]

they can not gain much we? if you've been introduced to fast food at a young age their body will adapt to it so they can not gain much weight?

For example:
-I've been introduced to fast food ever since I was two.
-Im 22 and I've eaten out everyday.
-I eat about 15 home cook meal a year.
-I KNOW I'm healthy because I'm not overweight, i can run 6 minutes mile, i did track and field and cross country for three years... etc.

****-and I think if you are introduced to fast food at a young age, your body adapt to it so you don't gain.

Let me know if you agree or disagree with that.