3

votes

Is it the caffeine or catechins (polyphenols) in green tea that is fat burning?

Answered on August 19, 2014
Created September 07, 2012 at 9:53 AM

Well, which is it? Or both? One more than the other?

Reason I ask is, I'd like to take the concentrated green tea polyphenol capsules and skip the caffeine bit....feeling too over stimulated.

96440612cf0fcf366bf5ad8f776fca84

(19463)

on September 08, 2012
at 10:57 PM

Oh, it's perfectly fine to do coffee with an IF. Caffeine actually opens up fat cells, if you have it by itself, and work out, (and if you add Yohimbine HCL) you can burn off quite a bit of stubborn fat. If you have coffee with sugar, and milk or with food, it can have the opposite effect - once insulin kicks in. Sorry, I misread the question, and thought it was about green coffee extract. By all means, have coffee or green tea if you're trying to lean out.

Medium avatar

(2417)

on September 07, 2012
at 11:27 PM

Excellent answer; exactly what I wanted to know. Thanks.

Medium avatar

(2417)

on September 07, 2012
at 11:17 AM

I see. I also do zero carb on rest days with carb feeds on training days (leangains). I IF daily 8pm-12pm. On rest days I walk and hour before breaking the fast. So if it isn't needed with VLC and IF'ing and simply regulates blood sugar, why do people who IF recommend that or coffee at the tail end of a fast (hr 12-16) to accelerate fat burning? If neither caffeine nor catechins facilitate lipid release from stubborn fat tissue and encourage its oxidation, why is the practice advocated by so many for exactly that end?

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2 Answers

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3
A2c38be4c54c91a15071f82f14cac0b3

(12682)

on September 07, 2012
at 06:38 PM

Actually, it's both. Studies on the isolated green tea catechin EGCG have shown that it doesn't do much for increasing energy expenditure (1) or reducing body weight (2) when removed from caffeine.

Caffeine does appear to increase energy expenditure (3,4), but compared to green tea catechins and caffeine, caffeine alone falls flat in increasing energy expenditure (5) and weight loss (6). One meta analysis of 15 studies concluded: "The administration of (green tea catechins) with caffeine is associated with statistically significant reductions in BMI, body weight, and WC...Current data do not suggest that GTCs alone significantly alter anthropometric measurements" (7).

This data suggests that caffeine and green tea catechins increase metabolism through a synergistic mechanism. This mechanism is not fully understood, but one theory is that because caffeine increases adrenaline and GT catechins inhibit the enzyme catechol O-methyltransferase that breaks down adrenaline, the combination of the two leads to a build up of epinephrine/adrenaline in synapses, boosting energy expenditure.

Medium avatar

(2417)

on September 07, 2012
at 11:27 PM

Excellent answer; exactly what I wanted to know. Thanks.

1
96440612cf0fcf366bf5ad8f776fca84

(19463)

on September 07, 2012
at 10:24 AM

It's the chlorogenic acid that does this. Polyphenols may help as well. See: http://blog.lef.org/2012/05/green-coffee-weight-loss.html and http://www.lef.org/magazine/mag2011/ss2011_Are-We-All-Pre-Diabetic_01.htm

However, if you're doing VLC (very low carb), or IF (intermittent fasting), it's not going to do very much for you, since what it does is to moderate sugar spikes.

I do a mostly VLC version of paleo with IFs (and carb refeeds after workouts), so if that's your path as well, don't bother with it.

Medium avatar

(2417)

on September 07, 2012
at 11:17 AM

I see. I also do zero carb on rest days with carb feeds on training days (leangains). I IF daily 8pm-12pm. On rest days I walk and hour before breaking the fast. So if it isn't needed with VLC and IF'ing and simply regulates blood sugar, why do people who IF recommend that or coffee at the tail end of a fast (hr 12-16) to accelerate fat burning? If neither caffeine nor catechins facilitate lipid release from stubborn fat tissue and encourage its oxidation, why is the practice advocated by so many for exactly that end?

96440612cf0fcf366bf5ad8f776fca84

(19463)

on September 08, 2012
at 10:57 PM

Oh, it's perfectly fine to do coffee with an IF. Caffeine actually opens up fat cells, if you have it by itself, and work out, (and if you add Yohimbine HCL) you can burn off quite a bit of stubborn fat. If you have coffee with sugar, and milk or with food, it can have the opposite effect - once insulin kicks in. Sorry, I misread the question, and thought it was about green coffee extract. By all means, have coffee or green tea if you're trying to lean out.

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