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Dehydration and an electrolyte imbalance (in particular lack of sodium) causes both "foggyness" and general confusion in people of all ages. In otherwise healthy American's its rare to have a lack of sodium, but in the ketosis community especially at the start, its something even they have to pay attention to. This is part of the problem with trying treat such diseases is that there are many things co-occurring. Along the same lines, lack of magnesium is very common. Both coffee and booze leach it from ones system, many american adults are encouraged to take a supplement. Lethargy(i.e. lack of focus), rather than disorientation tends to be symptomatic.

Yeah, what's fascinating is that some non-trivial percentage of your customers are going to be unhappy. Pretending it won't happen is silly. You're just insuring you don't have a strategy for when they are displeased. Some complain to your face, and in a perfect world you can do something to remedy that. Others behind your back, which is worse and unsolvable. Porridge should be not "too warm" nor "too cold" but "just right" Great, where have we heard that before.

Right and with that much work you know how to fix a menu so your food cost is managed. You know how many servers you probably need for that day of the week and how likely they are to disappear. You know how your staff will steal your booze, pocket the tips, or kill you clientele with a food allergy. You know how many people will complain and you will have to comp their bill. You know you should stock pile supplies because the vendor will run out. For an industry that is terribly easy to get into as a bus boy/server, prep cook, its amazing to me that more people don't just start there. Or maybe they do, but they don't write hand wringing articles about how they failed.(hopefully because they'd didn't and are too busy working). I once heard a story about an area for wine production in USA that you could buy for reasonable amount of money. Every few years, a 50 year old man would come and buy it, and start to work it. After 10 years about the time he might be getting the hang of what it all entailed he would be tired and sell it to the next 50 year old. The locals just watched the same story play out over and over again...

Running a restaurant is hard and unsurprisingly its even harder if you never have run one before. Staffing, food cost, vender management and health code malarky: these are some of the first things that make or break a restaurant. Then maybe location. Quality of food clearly doesn't make the list, at least not disconnected from price as Dominos, McDonalds and Starbucks succeed with high probability. Sad to see a vanity project eat up someones life.

Dimension reduction and clustering have long been the focus of AI/ML. Reference, Bishops book an early 2000's classic, Pattern Recognition and Machine Learning, chapter 9.1 is k-means clustering.