An article from the New York Times back in 2015 about how much junk food teenagers eat.
There was found generally to be little difference in the statistic in the gender, wealth or even whether the consumers were overweight or not. But there were some differences by race and ethnicity.
Non-Hispanic white teenagers received 17.8 percent of their calories from hamburgers, French fries and pizza, and non-Hispanic blacks 18.8 percent. But energy intake from junk food was just 14.9 percent among Hispanic teenagers, and 11.9 percent among Asian adolescents.
Most alarmingly children ages 2 to 11 consumed about 9 percent of their calories from junk food.