Unhealthy food Consumption of unhealthy food by children is a tragedy in today's world.
consumingconsumption among children is a tragedy of the present age.
The problem is best explained by parents' influences and the development of food industries,
... it does not give the idea that these are the reasons. Better rephrase this line again.
It is difficult to argue with the idea that parents play a strong role in their children's eating habits.
... I think you should remove the first part. It disturbs your main idea;Obviously, parents do play a major role in shaping their children's food habits. However, due to work pressures, busy schedules and various social and economic concerns, some parents tend to ignore this factor.