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I wonder if the inverse correlation between type 2 diabetes and coffee is because coffee drinkers generally consume fewer sweets and have less of a sweet tooth?
I regret to inform you from personal experience that this is not the case.
Isn't coffee and doughnuts a very classic combo?
Perhaps.

Another one is coffee and cigarettes.

That could be that nicotine causes you to metabolize caffeine quicker.
It's not nicotine but polycyclic aromatic hydrocarbons of tobacco that induce the CYP1A2 enzyme (which is the most important enzyme for caffeine metabilization).
> coffee drinkers generally consume fewer sweets and have less of a sweet tooth

Have you looked at the sugar content in a typical Starbucks drink? A lot of those contain 15 to 45 grams of sugar per cup.

Yes there are some people who make French press coffee and drink it with 0 sugar / cream but I'd say a lot of casual coffee drinkers aren't that health minded.

https://news.starbucks.com/uploads/documents/nutrition.pdf

I drink quite a bit of coffee, I use an aeropress and will sometimes add a little heavy cream but generally drink it without adding anything. I never add sugar.
I believe the coffee is prepared matters too.
Correlation does not imply causation...
It very much implies it. It just doesn't guarantee it.

Imply (verb): indicate the truth or existence of (something) by suggestion rather than explicit reference.

See "material implication" (https://en.wikipedia.org/wiki/Material_conditional), which is what most people here will likely mean when they say "implies":

> The material conditional (also known as material implication, material consequence, or simply implication, implies, or conditional) is a logical connective (or a binary operator) that is often symbolized by a forward arrow "→". The material conditional is used to form statements of the form p → q (termed a conditional statement) which is read as "if p then q". Unlike the English construction "if... then...", the material conditional statement p → q does not specify a causal relationship between p and q. It is merely to be understood to mean "if p is true, then q is also true" such that the statement p → q is false only when p is true and q is false.[1]  The material conditional only states that q is true when (but not necessarily only when) p is true, and makes no claim that p causes q.

I was able to finish reading the article before the page finished loading. To WebMD: Fix your ad networks and write better articles.
I suggest installing uBlock Origin and enabling the following filters:

www.webmd.com##.global-nav-megamenu

www.webmd.com##.main-container-3

www.webmd.com##.main-container-1

www.webmd.com###ContentPane1

www.webmd.com###ContentPane34

www.webmd.com###ContentPane50

www.webmd.com###ContentPane55

www.webmd.com##body > footer

www.webmd.com###ContentPane28

www.webmd.com##.archive-tag

www.webmd.com##.visually-hidden

After that, blocking every resource except images in uMatrix results in a beautiful, HTML-only page featuring text and images for the article only, without headers, CSS, sidebars, and ads.

Autophagy is induced by coffee. Just learned that today!

“Coffee triggers 2 phenomena that are also induced by nutrient depletion, namely a reduction of protein acetylation coupled to an increase in autophagy. We speculate that polyphenols contained in coffee promote health by stimulating autophagy.”

https://www.ncbi.nlm.nih.gov/pubmed/24769862/

Also watched this video from Found My Fitness[1] recommended in another HN post today [2]. It’s an interview with Dr Guido Kroemer. Very informative and research-based info about autophagy, mentions coffee as well as fasting.

[1] https://youtu.be/Gm626MgpveI

[2] https://news.ycombinator.com/item?id=17831003