Why do american raised indians look different than Indian raised indians?

I'm 67% indian been born and raised in California, USA my whole life, im 17. I've visited india like 7 times around and noticed that american raised indians look mush different than india's indians. I know factors like diet, climate, and pollution are big; but does anything change somewhat genetically or in development

EDIT: Thank you for all the people sharing reasons and explainig stuff instead of just saying bad stuff about any kind. Please keep your cope to yourself

EDIT (pt2): I got a DNA Test, almost 3 years ago this is how i Know