My theory is food recycling in getting people to consume and eat to lust/taste and gobble fast food to satisfy basic needs like minor hunger to severe hunger caused by world problems...the poorer you are the more you eat rubbish, ie MacDonalds, Spur, Steggles and Rainbow Chickens, Kentucky Fried, the increasingly to satisfy immediate hunger as in China the bigger the demand and commercial abuse to poison us..
A catch 22 situation , out of control and it will get worse, poor people cannot afford healthy food. And obese and glutenous people don't care to keep themselves fit and healthy.
That's just a simple example but it's more complex than this and it's a damn side deeper than this.
It's just a part of world's suicide, greed, power, control, exploit etc. etc.
Most "sheep" just follow and don't want to and some cannot avoid this.