the second is not a good source. The title is misleading as the article itself says experts don't agree.
I don't think it's clear what is an "addiction", as addiction is part of how humans (and all brains) work. reinforcement of reward is necessary for normal function. The most discrete sign of addiction would be the molecular switch DeltaFosB which is manifest in behavioral and drug addictions. However, for things like sugar things are more nuanced.
The two are also hard to compare side-to-side because alcohol addiction is like 50-70% genetic, and the effects tend affect other people more severely while sugar basically harms the person who eats it.
That's the genetic fallacy. They link to a number of other sources from that article with supporting information such as a Connecticut College study and a Princeton University study. I would deem university sources "good" (although you're still subject to cherry-picking and the like)
I don't think it's clear what is an "addiction", as addiction is part of how humans (and all brains) work. reinforcement of reward is necessary for normal function. The most discrete sign of addiction would be the molecular switch DeltaFosB which is manifest in behavioral and drug addictions. However, for things like sugar things are more nuanced.
The two are also hard to compare side-to-side because alcohol addiction is like 50-70% genetic, and the effects tend affect other people more severely while sugar basically harms the person who eats it.