I need to choose my topic by Natacha

"The rich countries have a duty to help the poor ones"
 or  
"We should teach our children to eat healthily"

I need to choose my topic, but I am getting confused due to these both topics are very important.

First of all, I consider we have got a big problem in the world because a lot of people are starving every day.
Whereas lots of children are eating junk food, and nowadays Spain is the first European country in childhood obesity.

• How is that  possible?  

• We have got a Mediterranean diet, the richest diet.  What are we doing badly?

• What do you think is the problem? And the solution? 

• Do you know that there are a lot of obese or overweight children? 

• Do you know that probably it is going to be the first generation who is going to have a lower life expectancy than their parents?

https://youtu.be/FId8iTgmYBo

Source:  theweightofthenation.hbo.com