Some foods high in sugar, fat, etc. can cause brain changes in our brains similar to a cocaine or heroine high - or a dopamine high (from link below).
What MacDonald's knows...
"...but we can't help ourselves, because sugar lights up our brain's reward pathway."
Mice without sense of taste were given choice of sugar water or plain water...
Quote:When the scientists analyzed the mice brains, they found that the mice released dopamine in response to sugar water, even though they couldn't taste it, but not in response to regular water or sucralose. Our brains can tell the difference between high calorie foods and diet foods even if they taste the same.
Quote:As suggested by Jonah Lehrer in "The Frontal Cortex," our brains evolved during a time when food was scarce, so we became adept at choosing foods that packed calories.
Quote:Brains are calorically demanding organs. Our distant ancestors had small ones. Australopithecus afarensis, for example, who lived some three million years ago, had a cranial capacity of about four hundred cubic centimetres, which is roughly the same as a chimpanzee’s. Modern humans have a cranial capacity of about thirteen hundred cubic centimetres. How, as their brains got bigger, did our forebears keep them running? According to what’s known as the Expensive Tissue Hypothesis, early humans compensated for the energy used in their heads by cutting back on the energy used in their guts; as man’s cranium grew, his digestive tract shrank. This forced him to obtain more energy-dense foods than his fellow-primates were subsisting on, which put a premium on adding further brain power. The result of this self-reinforcing process was a strong taste for foods that are high in calories and easy to digest; just as it is natural for gorillas to love leaves, it is natural for people to love funnel cakes.
That is why implementing a ban on advertising of junk food to kids 12 is a wise move IMO.
Quote:“The most devastating part of this trend is that obesity will mark our DNA, changing our metabolism and genetically reprogramming future generations of children to be at greater risk of being overweight,” the report states.