Yep. I only drink black coffee, no sugar, and I don't eat sweets, cookies, or anything. In fact, I mostly don't consume anything but coffee from I wake up until dinner time, 6-7 PM.

So you're repeatedly having coffee on an empty stomach? That can't be good for you.

Haven't noticed any of the supposed side-effects doing so could cause. For a while, not eating for hours was also supposedly bad for you. Then fasting started to show benefits. It turns out traditional dietary advice might not be worth jack shit.

https://www.coffeeandhealth.org/topic-overview/coffee-and-di...

One study found a slight increase in acid reflux when drank on an empty stomach, a problem I don't have, other than that there does not seem to be any associations with gastritis, ulcers, or dyspepsia.

Yes, intermittent fasting is said to be quite good for organisms. Maybe a form of hormesis. I'm unfortunately not in a position to comment much on caffeine's health effects aside from various interesting and likely true points of speculation but I find what you shared interesting and do not doubt for a second that medical science (including nutrition, and immunity) is not properly understood except by a rare handful who have the ability to see things whole.

I believe coffee has a lot of beneficial properties, but I have a slight concern regarding caffeine as it reduces CBF. That might impair cognitive functions. Supposedly you can mitigate some of the vasoconstriction with flavonoids.

https://www.ncbi.nlm.nih.gov/m/pubmed/19219847/

I always drink my coffee black. I don't drink the stronger blends like you might get in a French roast or at Starbucks. I do dring espresso however a few times a year.

I think Starbucks tries to cater to people who like the flavours in black coffee, but enjoy drinking their coffee with dairy. My theory is that it's 'roasted to pair with dairy' and if you drink starbucks coffee black, cold brew, or espresso without dairy, you're missing half of the 'starbucks' flavour.

I prefer my coffee black, so that makes starbucks worse than most fast-food coffees flavour-wise (though I still enjoy Starbucks locations and amenities better :D)

This, like some other comments here, are variables easily controlled for.

Coffee is not supposed to be sweet or iced for that matter. The only proper way to drink coffee is either black or with a little milk. :)