Yes
No
Yes, but they should be clearly labeled

There is too much food on offer
They do not move enough. Not enough sport
Not enough information about healthy food
Eating out of frustration
They are influenced by publicity
They are eating out of boredom
Too much fast food
Parents have no time to make sure their children eat healthy food
Many obese people means: we are living in a rich country
Looks are not important for them
I do not know