カフェインが直接インスリンを放出させてるんではないらしいという（20世紀末に書かれた）話はあるよ
このへんの知見は20年経っても変わってないと思われ

319: [sage] 2016/05/11(水) 20:01:08.07 ID:eQB6wUsr
Lyle McDonald "The KD" より転載

Caffeine (p.166)

Although caffeine is discussed in more detail in the supplement chapter, its potential effects on ketosis are addressed here.
A popular idea floating around states that caffeine raises insulin levels which might possibly disrupt ketosis.
As well many individuals find that some caffeine containing drinks, such as diet soda, can interrupt ketosis.
However, this is contradictory to the known effects of caffeine ingestion, which are to raise levels of adrenaline and noradrenaline and raise FFA levels.
The only way that caffeine could raise insulin would be indirectly.
By raising adrenaline and noradrenaline levels, ★★caffeine might cause liver glycogen to be broken down into glucose and released into the bloodstream, raising insulin★★.
★★This would only occur prior to ketosis being established★★, such as ★★after the carb-load phase of the CKD★★, and would help a dieter to establish ketosis.

(p.117)
Despite popular belief, caffeine does not raise insulin except indirectly, and should not negatively affect ketosis.

結論：まったく問題なす
http://rio2016.5ch.net/test/read.cgi/shapeup/1459504774/317-319