I wouldn't say it is all genetic. There are certainly environmental factors that can make a person develop alcoholism, such as exposure to alcohol. No alcohol = no alcoholism.
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One example is connected to the statistical assumptions of classical biology as applied to life. It has been known for some time that proteins are bound together with very weak binding forces and can be easily denatured. Proteins are held together with the binding strength equivalence of a few hydrogen bonds. Due to these weak binding forces and the thermal energy in water, classical statistical assumption assume proteins should fold with average folds, governed by statistics. Over 50 years ago, it was observed that proteins actually fold with exact folds not governed by statistics; probability=1.0.QuoteOne is reminded here of the problem of protein folding. As I have pointed out elsewhere (Watterson, 1997), that problem also arises from applying classical theories, since they predict an average, not a unique fold. That these questions remain unsolved still today after 50 years of intense research effort, highlights a two-fold failing of statistical methods: firstly, they did not predict the existence of a stable folded state, and secondly, once given as an experimental fact, they cannot explain it.
The dogma of statistics is so blindly followed and taught in biology, science has been willing to ignore hard reality for over 50 years. One only has consider how many students have been indoctrinated with science misinformation, due to the blind faith in a god of casinos. In this religion, one worships with black boxes and blind folds, to appease a god of chaos and gambling, using math oracles. This religion is old and dates back to before the age of enlightenment.
On the other hand, this religion may not be entirely based on blind religious faith. It may also have a medical explanation. Gambling is very addictive. Any religion of jackpots and lotteries may be very hard to give up, due to the compulsive behavior associated with gambling. If you had a religion centered on alcohol or drugs, the drug addiction itself will make it hard for reason to get through the compulsive actions; physiological faith.
In US, there is a separation of church and state, so maybe the government needs to be consistent and not support any faith based science. It may be healthy for the addiction to confront itself, so it can sober up to get back in graces; tough love.
Our taste receptors and brain evolved to reward the consumption of high concentration of essential nutrients that may have been rare. In modern day, food scientists concentrate those nutrients in our food to hijack the reward mechanism.I was a big fan of donuts long before anyone was doing "food science".
The problem isn't so much with the concentration- as with the total amount. It's easy for most of us to get a lot more food than we need. That's more to do with agriculture than food science.