It's interesting because excess stress can actually damage your DNA. How much so and how much it affects your children, I don't know. I suspect if you took an average European child and plonked them in a deprived part of Chad, they would fare about as well in life as your average Chadian child. And vice versa for a Chadian child in Europe.
> you can hardly change the climate or the geography
You can introduce new technologies to make the most of what they have. For example better water management and improved crop strains.
A Chadian child in Europe will enjoy a vastly better environment and healthcare which would prevent many potential diseases it would develop in Chad, but it would still be susceptible to diseases uncommon for Europeans and will have a vastly lower life expectancy.
Under the severe conditions in Chad, a European child would still overtake Chadian children in its overall development, but would be susceptible to many local diseases. If the child manages to survive these diseases, it will enjoy a considerably longer and healthier life in that same environment.
Do you have anything to back up these claims? They seem outlandish to me.
For example, there are plenty of African migrants in Europe. I've never heard anything about a vastly reduced life expectancy. There are some small dietary problems they might have if they switched to local food and drink, but I would have thought that their immune system would adjust over time.
> you can hardly change the climate or the geography
You can introduce new technologies to make the most of what they have. For example better water management and improved crop strains.