@BRUTE: Oh, indeed; I was focusing on its "uncomfortable" aspect; after all, and interestingly, the symptoms I mentioned are the same exhibited by some teenagers when they are forced to go cold turkey on smartphones—conversely, who knows what kind of poison gets mixed into the heroin that reaches Brazil; it is surely not hospital-level pure. As for the doughnuts, I remember Nassim N. Taleb saying that the addiction to carbohydrates is one of the three most harmful ones—the other two being to heroin and to a monthly salary.
@subgard: I surely get the point. I have seen and experienced what living in subhuman conditions can do to our minds; being deprived of the basics—not just food and shelter, but also (and specially) decency and respect, for example—can make us feel beast-like and even behave accordingly. Thus my disagreement regarding your argument does not concern substance, but gradation—I mean that it takes time and a lot of pressure before we start forsaking our humanity, as it were. In the level of skipping a few meals and worrying about debt, the result can indeed resemble addiction (for, as you correctly pointed out, the patterns and mechanism are the same), but it takes much more than that before we actually reach a condition akin to being hooked to a hard drug.
@7Wannabe5: I hope you have never had to undergo the kind of experience that demonstrates how right you are about that, but I can attest to the truth in your words. Last place I rented was a room in a boardinghouse that had no windows; the neighbourhood being really tough—guys smoking crack in broad daylight, muggers roaming around with guns—I only went out to eat on a government-sponsored restaurant that served a R$ 1.00 meal at noon on weekdays—basically all my nourishment came from there. During the weekend, though, when the place was closed, I survived on the few loaves of bread I could afford (sometimes with slices of cheese), and that was it. After two days in the darkness, munching carbohydrates, leaving that hole and getting to bask under the hot, tropical sun was the most unbelievably delightful experience; I could feel my brain getting back on track, the gears slowly beginning to turn again. The amount of pleasure I can derive from that bright star in the sky is outlandish, something that I will always have and that I doubt most people can imagine—unless they have lived under a perpetual winter, been incarcerated, or something of the sort.