difficult easy expensive
Firstly, it is  [MASK]  to make .It doesn't take much money to  make  junk food .Secondly ,it is quick and easy for people to have .Thirdly many people ,including children ,like it  because  it tastes good .Lastly ,most junk food has food additives .So it  looks  and tastes better ,and can be kept for a long time .