There is a chemical in your brain called dopamine which is an important part of how we feel pleasure. Use of recreational drugs and alcohol causes a rush of this chemical and that is part of the pleasure we feel from using them. The problem is that regular use of such chemicals causes us to have lower levels of dopamine when we are not using them. We end up feeling a desire for the drug or booze to get our dopamine levels back up.
Diets high in sugar, salt, and carbs also causes a dopamine rush. When you eat that food regularly, it lowers your normal dopamine levels, just like drugs and alcohol do, if not to the same level. That is why you feel that craving. Eating such food occasionally is fine, but if you do it to often, you can literally get an addiction to it.
RobotToaster@mander.xyz 12 hours ago
The same reason people will logically understand that crack is bad for them but crave it like crack
Magister@lemmy.world 12 hours ago
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prettybunnys@piefed.social 10 hours ago
This is actually shockingly remarkably true.
There is very little to differentiate your addiction to junk food and your addiction to sex or your addiction to crack rock.