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In one study, a group of overweight women were offered two drinks that appeared and tasted identical. However, one contained only sugary carbohydrates, such as dextrose and rice syrup, while the other had some protein added. First, they were made to feel depressed by thinking about something sad, when they were given the drink most of them preferred the pure carbohydrate drink reporting that it cheered them up. Experiments like these are regularly used to test if a drug is addictive.
Eating ‘high glycemic index’ foods causes a sharp spike in the blood sugar level causing changes in various chemicals and hormones, including insulin and an amino acid called tryptophan in the brain. This creates more serotonin, the brain chemical known as the ‘happy hormone’. Nicotine also raises serotonin levels explaining why high-sugar foods can give you a temporary 'lift' if you're feeling low or irritable – in the same way a cigarette does. It’s an instant hit ensuring a strong association between the drug of choice and that feeling.
Blood sugar explained: