Does black coffee break an extended fast?

Bruce_H · 2018-07-02 15:54:49 UTC

I have fasted for short periods before when not on keto and been a purist with water only. I’m almost 60 hours in to my first extended keto fast and have been drinking black coffee and was wondering if that interfered with the intent of keto related fasting.

I searched the forums but nothing clear and concise jumped out at me. This article I found summarized it well and thought I’d post a topic specifically on the subject for others that are new and curious about the same.

So I’m moving forward with the assumption that the moderate intake of black coffee actually aids some of the healthiest aspects of keto related fasting, e.g. autophagy, ketosis and hormesis.

http://siimland.com/can-you-drink-tea-and-coffee-during-fasting/

Anniegirl9 · 2018-07-02 17:35:22 UTC

I don’t think plain coffee or tea break fasts. But with added butter, creams and oils, it definately can.

Brenda · 2018-07-02 17:45:53 UTC

Plain coffee or tea is absolutely not considered breaking a fast. There is some new research out there that coffee may possibly interrupt autophagy, but if that’s not your main purpose, then you’re good.

PaulL · 2018-07-02 19:04:12 UTC

Two things I have learned from these forums:

Coffee absolutely enhances ketosis.
Coffee absolutely prevents ketosis.

OldDoug · 2018-07-02 19:15:27 UTC

Dang… This is one of those unsettled things, then - I’d thought that if anything coffee boosted autophagy.

ncbi.nlm.nih.gov

Coffee induces autophagy in vivo.

F Pietrocola, SA Malik, G Mariño, E Vacchelli, L Senovilla, K Chaba, M Niso-Santano, MC Maiuri, F Madeo and G Kroemer, Cell cycle (Georgetown, Tex.), 2014

Epidemiological studies and clinical trials revealed that chronic consumption coffee is associated with the inhibition of several metabolic diseases as well as reduction in overall and cause-specific mortality. We show that both natural and decaffeinated brands of coffee similarly rapidly trigger autophagy in mice. One to 4 h after coffee consumption, we observed an increase in autophagic flux in all investigated organs (liver, muscle, heart) in vivo, as indicated by the increased lipidation of LC3B and the reduction of the abundance of the autophagic substrate sequestosome 1 (p62/SQSTM1). These changes were accompanied by the inhibition of the enzymatic activity of mammalian target of rapamycin complex 1 (mTORC1), leading to the reduced phosphorylation of p70(S6K), as well as by the global deacetylation of cellular proteins detectable by immunoblot. Immunohistochemical analyses of transgenic mice expressing a GFP-LC3B fusion protein confirmed the coffee-induced relocation of LC3B to autophagosomes, as well as general protein deacetylation. Altogether, these results indicate that 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.

Brenda · 2018-07-02 19:21:57 UTC

TL;DR
Lol. No doubt there is conflicting evidence out there.
Protein interrupts autophagy. Coffee has a small amount of protein, trace, so if autophagy is very very important to you, you might want to skip the coffee. Such as if you are a fasting because you have cancer. Then it becomes of paramount importance to make sure you remain in autophagy.

Brenda · 2018-07-02 19:20:49 UTC

Autophagy and ketosis are two different things.

No way coffee interrupts ketosis.

PaulL · 2018-07-02 19:21:42 UTC

Glad to hear it, Brenda! They’ll have to pry my coffee mug from my cold, dead hands, lol!

Brenda · 2018-07-02 19:22:17 UTC

Me included. I was getting agitated for a minute there. LOL