Ok user, I’m going to need to elaborate on this for you:
The human population of any nation can only consume a certain amount of food, in order to maintain a healthy weight, therefore food corporations are stuck at a rate of growth that matches that of the growth of the population.
In the UK (I’m British) the population's growth rate is currently 0.6% per annum, therefore corporate food suppliers in the UK are stuck at an 0.6% yearly rate of growth.
In order to increase profits, and grow financially, these corporations have two options:
1) Increase the price of their products.
2) Encourage people to eat more.
They pursue both of these avenues with great vigour.
However, the raw materials that go into producing processed foods (glucose-fructose syrup, dextrose, maltodextrin, lactic acid, triglycerides of fatty acids, etc.) are incredibly cheap, due to the subsidisation of grain farming, particularly corn, which is carried out on unprecedented scales due to the use of fossil fuel based pesticides and fertilisers, as well as genetic engineering.
Therefore, although the price difference between raw materials and finished product is significant, and subsequently allows for an excellent profit margin, these products are still relatively cheap, and of course highly accessible.
This results an almost inexhaustible supply of easily affordable yet overpriced - cheaply produced - processed foods, which the public are encouraged to consume evermore of, through elaborate advertising and marketing campaigns, often targeted specifically at children.
And our public leaders wonder why we have an obesity epidemic, while having the audacity to tell people that if they want to lose weight they simply need to exercise more.
Exercise? Try burning off a large Big Mac meal and a giant cookie by jogging and see how it goes.
Here's some insight, it'd likely take you half a day.