Coffee a metabolism-killer?
Replies
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I have consumed 6 cups daily for months-dropped 17 pounds---does slow metabolism mean weight loss--maybe I ought to drink more coffee? Seriously, its coffee--my metabolic rate is not determined on my one intake(caffeine)--but more likely by all intake, activity level, etc.0
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Lol oh God I love youI read both the positive and the negative reviews of the book on Amazon. Here's what the most helpful positive reviewer claims: "For example, if you can't give up your coffee, eat first. Coffee on an empty stomach is a metabolism killer because it pulls sugar from your muscles to balance hormones."
So it's not about coffee being a metabolism-killer in general, just the idea of having it on an empty stomach. I don't know if the statement above is true or not. It probably depends on how long you wait before you eat something. I do know that coffee is quite acidic and so drinking it on an empty stomach can make you feel lousy. I prefer to have my coffee after meals, but that's just me.
Bull.
Anything you consume takes 20 min to 20hrs to be absorbed. Caffeine bioavailabilty is relatively fast with peak bioavailabilty at about 2 hrs (as shown by blood sampling studies). In general, unbound sugars have a bioavailabilty that is quite higher with an initial peak at about 30 min.
<insert gif of food slurry in stomach>
Now, let's assume that wasn't true. What is this "sugar being pulled out of muscles"? Let's say its a bit of glucose and let's assume she's right for the sh!ts and giggles. Would that be the same glucose that is used by your brain when you sleep? Or that glucose that is used up during exercise? Hmmm, gotta stop sleeping and exercise, too. 'Cause hormones.
A study that says something: http://ajcn.nutrition.org/content/51/5/759.short
Caffeine does affect blood glucose levels - in diabetic rats and at levels of 50 g/ kg weight.
Another study, with science: http://imr.sagepub.com/content/40/6/2220.abstract
That's about 1/2 cup per kg. so I'd have to drink 40 cups of coffee (long term and be diabetic) to see an impact on blood glucose (according to that study).
Who known maybe that nutritionist isn't blathering and has a secret lab.
< insert gif of secret lab>
Time for coffee. I shouldn't read the forums in bed. They get my hormones all unbalanced.
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That single cup of coffee I have first thing in the morning on an empty stomach must be the only thing holding me back from being the size of a pro level bodybuilder....damnit I knew it had to be something simple like coffee killing my goals:drinker: :mad: :sad:0
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My friend is a body builder and a trainer of pro athletes. He admonished me for drinking black coffee during my morning workouts. He said something along the lines of it releasing cortisol and stripping the body of other nutrients. I have stopped drinking coffee during my workouts (I get my caffeine from my preworkout sup) and now drink water instead, and I do feel better. I save my coffee drinking for the office after my morning workout.
What is it in the coffee that does that then? Did he tell you why caffeine in coffee does that and caffeine in your pre workout doesnt? Seems like broscience to me.
Original article as well.
This is the kind of crap that people (like myself in the past) focus on that truly doesn't matter and is a waste of time worrying about.
I don't know the science, and quite frankly don't care. I do know how I feel, however. I am a huge coffee fan and will never give it up, but changing up when I drink it has been beneficial for me. Drinking cold water instead of hot coffee during my workout has been a good change- no more dry yuck-mouth. I always have done pre-workout sups (I like the Nitric Oxide buzz and the caffeine helps me avoid caffeine withdrawal).0 -
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NO! Just NO!
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I read both the positive and the negative reviews of the book on Amazon. Here's what the most helpful positive reviewer claims: "For example, if you can't give up your coffee, eat first. Coffee on an empty stomach is a metabolism killer because it pulls sugar from your muscles to balance hormones."
So it's not about coffee being a metabolism-killer in general, just the idea of having it on an empty stomach. I don't know if the statement above is true or not. It probably depends on how long you wait before you eat something. I do know that coffee is quite acidic and so drinking it on an empty stomach can make you feel lousy. I prefer to have my coffee after meals, but that's just me.
Bull.
Anything you consume takes 20 min to 20hrs to be absorbed. Caffeine bioavailabilty is relatively fast with peak bioavailabilty at about 2 hrs (as shown by blood sampling studies). In general, unbound sugars have a bioavailabilty that is quite higher with an initial peak at about 30 min.
<insert gif of food slurry in stomach>
Now, let's assume that wasn't true. What is this "sugar being pulled out of muscles"? Let's say its a bit of glucose and let's assume she's right for the sh!ts and giggles. Would that be the same glucose that is used by your brain when you sleep? Or that glucose that is used up during exercise? Hmmm, gotta stop sleeping and exercise, too. 'Cause hormones.
A study that says something: http://ajcn.nutrition.org/content/51/5/759.short
Caffeine does affect blood glucose levels - in diabetic rats and at levels of 50 g/ kg weight.
Another study, with science: http://imr.sagepub.com/content/40/6/2220.abstract
That's about 1/2 cup per kg. so I'd have to drink 40 cups of coffee (long term and be diabetic) to see an impact on blood glucose (according to that study).
Who known maybe that nutritionist isn't blathering and has a secret lab.
< insert gif of secret lab>
Time for coffee. I shouldn't read the forums in bed. They get my hormones all unbalanced.
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Opposite - Coffee (and the caffeine in it) boosts metabolism. I know that from a dietician I used to work with.
I guess anyone can put anything online/in a book these days...0 -
As I was browsing my daily websites, I came across an article named "Little Ways to be Happier and Healthier"
One of it's claims is that coffee before breakfast is a metabolism killer.
Just wondering what your thoughts were? (I have zero plans to give up my weekend coffee-before-breakfast routine)Eat a little something before you caffeinate, okay? 'Caffeine before breakfast is a metabolism-killer,' says Haylie Pomroy, nutritionist to stars like Jennifer Lopez and Reese Witherspoon and author of The Fast Metabolism Diet. 'If you ingest coffee with no food on board, your body is more likely to lose muscle, instead of burning fat.'
http://lifestyle.ca.msn.com/living/inner-you/little-ways-to-feel-healthier-and-happier#image=3
It would be wise to disregard this terrible advice.0 -
But what does Dr. Oz have to say about it?0
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I've only read that coffee actually enhances thermogenesis.. fat burning.
*shrug*0 -
But what does Dr. Oz have to say about it?
NO. :noway:0 -
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When I had my BMR measured in the phsiology lab they specifically told me not to have coffee that day (among other things) because it raises the reading.
I know some people who feel queasy if they have coffee on an empty stomach, but that's a completely different issue.
Nutritionists really do talk a lot of bollocks.0 -
1. Make unfounded claims
2. Write/publish "diet" book
3. Profit!0 -
no coffee, no workee.
I am down from 6-8 cups a day to 3-4....
I have mine on an empty stomach most morning.0 -
I'm on my second coff of cuppy. I usually drink tea. Today I felt like killing my metabolic rate. Next, I'm going to go through all my books and making them politically correct by changing words like penMANship to handwriting, freshMAN to first-year student
while you're at it, change MENopause to personapause0 -
I read both the positive and the negative reviews of the book on Amazon. Here's what the most helpful positive reviewer claims: "For example, if you can't give up your coffee, eat first. Coffee on an empty stomach is a metabolism killer because it pulls sugar from your muscles to balance hormones."
So it's not about coffee being a metabolism-killer in general, just the idea of having it on an empty stomach. I don't know if the statement above is true or not. It probably depends on how long you wait before you eat something. I do know that coffee is quite acidic and so drinking it on an empty stomach can make you feel lousy. I prefer to have my coffee after meals, but that's just me.
Bull.
Anything you consume takes 20 min to 20hrs to be absorbed. Caffeine bioavailabilty is relatively fast with peak bioavailabilty at about 2 hrs (as shown by blood sampling studies). In general, unbound sugars have a bioavailabilty that is quite higher with an initial peak at about 30 min.
<insert gif of food slurry in stomach>
Now, let's assume that wasn't true. What is this "sugar being pulled out of muscles"? Let's say its a bit of glucose and let's assume she's right for the sh!ts and giggles. Would that be the same glucose that is used by your brain when you sleep? Or that glucose that is used up during exercise? Hmmm, gotta stop sleeping and exercise, too. 'Cause hormones.
A study that says something: http://ajcn.nutrition.org/content/51/5/759.short
Caffeine does affect blood glucose levels - in diabetic rats and at levels of 50 g/ kg weight.
Another study, with science: http://imr.sagepub.com/content/40/6/2220.abstract
That's about 1/2 cup per kg. so I'd have to drink 40 cups of coffee (long term and be diabetic) to see an impact on blood glucose (according to that study).
Who known maybe that nutritionist isn't blathering and has a secret lab.
< insert gif of secret lab>
Time for coffee. I shouldn't read the forums in bed. They get my hormones all unbalanced.
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1. Make unfounded claims
2. Write/publish "diet" book
3. Profit!
I thought step 1 was to gather underpants?0 -
I find that a couple mugs of strong coffee in the morning helps to - ahem - get things moving...0
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My own experience - have continued to drink coffee, at least one cup, sometimes two, before eating any breakfast.
did this before I started trying to lose weight and afterwards.
Am losing weight at my desired pace so will continue along with the coffee.0 -
Unless you exercise hard, your body has enough Glycogen to last about a day with zero food intake. If you run, you can use it up in a couple of hours. When you wake up in the morning at six and you had dinner at 6 PM, your body can take about 4 hours to digest it, so you're fasting for about 8 hours. Coffee actually increases your metabolism slightly, but you got plenty of Glycogen in store that your body isn't even touching fat, let alone consume muscle protein.0
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For the safety of others, I drink coffee first thing in the morning, before anything else.
haha. I agree with that!0 -
Hey, if she's the nutritionist to the stars and has written a book it must be true........I'm convinced, no need for science here. /sarcasm
LOL! I was thinking the same thing.
I don't get how it can kill your metabolism or how it has anything to do with weight loss or inhibiting it.0
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