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Juice Fasting & Ketosis

Commented on February 16, 2018
Created January 08, 2012 at 12:08 AM

forgive me if i'm simplifying far too much... but being paleo / living in ketosis for much of each week (I'm a little relaxed on wkends w/healthy carbs (tubers))... i started wondering...

Is a juice fast pointless - or counter-intuitive for weight loss?

Now I know plenty of folks use juice fasts for health benefits they claim - and I'm not arguing that. Only re: weight loss. (end of disclaimer)

My thought process is, if you are low in glucose, the body must convert fatty acids to ketones for happy-thinky time. But, if fasting with juice (fructose)... wouldn't that end ketosis immediately, thereby sorta reversing the effects of ketosis?

Again, maybe I'm trying to simplify something that isn't simple... so forgive me. I'm merely a "student". =)

thanks in advance.

2954a865cc56fe6692b3b39ea9692179

(0)

on February 16, 2018
at 10:03 PM

I juice cleansed a few years ago and kept most of the weight off. I too was inspired by fat sick and nearly dead. Since then I have moved towards a low carb high fat diet-paleo(esk) diet.  I’ll share what I am gearing up to do...

-veg juice cleasnse for healing & weightloss - 7 days

-Water fast for 3-5 days (with a little pink salt and liquid minerals )

- THEN bone broth and exogenous ketones for 3 days.

- THEN slowly back to my LCHF lifestyle. 

For juice cleanse mostly celery with spinach, cilantro, cucumber ginger and turmeric the only fruit being 1/2 a lemon per full days worth of juice. I water my juice down and add some George’s aloe Vera. 

 

Good luck!

82166cc32b6cf26de33b69f58fb583b1

on January 02, 2013
at 01:34 PM

You've asked an intelligent question. There's no need to apologize for it. The effect of sugar (juice) on your weight loss depends entirely on how much juice and other foods you eat. If your diet is hypocaloric, you will lose weight regardless of whether your ketostix turn purple. Your body can burn fat without elevated ketosis. The reason ketosis is connected with weight loss is that it suppresses appetite. If your appetite is sufficiently suppressed that you eat a hypocaloric amount of juice and you don't compensate by overeating on other days, you will lose weight.

82166cc32b6cf26de33b69f58fb583b1

on January 02, 2013
at 01:26 PM

The thing that determines whether you're losing or gaining weight is the amount of available calories you're eating. If you can limit your diet to 300 or 400 kcal per day of juice, and eat nothing more than that, you will lose weight regardless of whether your ketostix turn purple. Your body can burn its own fat without ketosis and in fact it normally burns its own fat without ketosis. The reason ketosis is connected with weight loss is that it suppresses appetite.

3327924660b1e2f8f8fc4ca27fedf2b2

(2919)

on April 26, 2012
at 08:48 AM

Ketosis doesn't mean NO CARBS...Ketosis is a way your body burns fat. Low-carb doesn't even mean no carbs. I don't know anyone doing low-carb who wishes to get their carb amount to 0.

96440612cf0fcf366bf5ad8f776fca84

(19413)

on January 08, 2012
at 03:06 PM

Yup juice=carbs, carbs=no ketosis. Well, if you go over a certain threshold, which is pretty low anyway.

0d0842381492a41b2173a04014aae810

(4875)

on January 08, 2012
at 12:55 AM

Happy-thinky-time! Thanks for the laugh. :)

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10 Answers

3
25b139cc1954456d9ea469e40f984cd3

on January 08, 2012
at 09:12 AM

If your goal is the fastest possible improvement in body composition, a juice fast is the opposite of the correct approach--a "protein fast" (protein-sparing modified fast AKA PSMF).

A book: http://www.bodyrecomposition.com/the-rapid-fat-loss-handbook

A thread: http://board.crossfit.com/showthread.php?t=41908

2
0d0842381492a41b2173a04014aae810

(4875)

on January 08, 2012
at 12:53 AM

Since shifting towards paleo my occasional juice fast has turned into a bone broth fast. Just based on the way it makes me feel, I believe it to be much more nurturing to the body.

That said, certain vegetables do have detoxifying properties, and I think there is some merit to vegetable juice fasting in certain situations. A blend of celery, leeks, garlic, onion and spinach will work miracles for cleansing from a [post-antibiotic] candida overgrowth.

I suppose if you were deficient in certain vitamins or minerals, providing an abundance of those in an easily absorbable form could do some good. One would need to research what they were soluble in and be sure to provide some fat if they were going after things like vitamin A, E or K. I feel like most of your average vegan "juice fasting is the key to health" sort of websites fail to acknowledge the scientific aspect of things in that regard.

Off-hand, I can't think of another situation where I would recommend someone do this to themselves. And yes I do agree that fruit juice fasting is just a way to fast while still limping along on your dietary glucose instead of switching to burning some fat.

1
8767a1533a7b3ed96dd3edb70df9bc90

on March 02, 2012
at 03:21 PM

I have been juice fasting since January 9th.

I was on juice only for 10 days, then veggies, fruits and lean meats for 10 days, then juice only for 10 days, then "paleo" for 10 days and now I'm on day 12 of my third juice fast.

I find the juice fasting to be highly beneficial. It has truly cleansed my system and kicked me into a state of much better health. Mind you, I'm not drinking just fruit juices. I juice spinach, cabbage, tomatoes, cucumbers, kale, broccoli, asparagus, green/red peppers, etc. into my apple, lemon, grape, grapefruit, orange, pear, blueberry, strawberry, blackberry and cantaloupe. I also add ginger root. Marvelous stuff, ginger root. :)

When I come off my juice fasts, I make a stew that consists of all the above veggies, some lean chicken or some lean beef. I also add avacado and banana (not to the soup! to my diet! LOL).

I've managed to drop from 232 to 208 in that time period--with some jags upward when I came off my juice fasts and had solid food back in my system.

I have a long way to go yet (my goal is 170) -- but I find that the juice fasting works very well for me.

For lunch at the office, since I don't like juicing and then storing the juices for a period of time (I believe you lose nutrition that way), I generally take a can of spicy V8. I know some people have issues with it, but it works for me.

I'm considering breaking my fast and having solid food again this weekend--and I'm also considering a 40 day juice fast through the month of April.

I've been tracking my efforts on a blog: http://benrogersjourney.blogspot.com/

1
363d0a0277a8b61ada3a24ab3ad85d5a

(4642)

on January 08, 2012
at 12:17 AM

I went through a health scare earlier this year in which I could barely eat anything without severe nausea. During this time, I was only able to squeak in 100-400 calories of juice in per day (apple or grape usually) and I was registering very high ketones, and lost 60 lbs in just over 2 months. This is not something I would recommend of course, but you can consume some juice and be in ketosis, but not much. I think juice "feasting" as it is called is better because it isn't done for weight loss as much as filling you up with nutrition. That being said, if I were to do a juice fast or feast, I would incorporate bone broth and probably take some fish oil.

Otherwise, straight water fasting would be better for weight loss, or eating properly. Some of us have issues with this (I am one of them). I also like to water fast for a few days to kick myself into ketosis if I fell off the wagon and have slipped into sugar addiction. This is just personal stuff, hopefully you don't have a sugar problem. Wishing you the best.

1
Dfada6fe4982ab3b7557172f20632da8

(5332)

on January 08, 2012
at 12:13 AM

I can't speak from experience because I've always similarly found juice fasting illogical. I find it much easier to fast properly, and eat properly when I'm eating. But then we wouldn't recommend juice anyway. Now a bone broth fast, that might be more fun.

96440612cf0fcf366bf5ad8f776fca84

(19413)

on January 08, 2012
at 03:06 PM

Yup juice=carbs, carbs=no ketosis. Well, if you go over a certain threshold, which is pretty low anyway.

3327924660b1e2f8f8fc4ca27fedf2b2

(2919)

on April 26, 2012
at 08:48 AM

Ketosis doesn't mean NO CARBS...Ketosis is a way your body burns fat. Low-carb doesn't even mean no carbs. I don't know anyone doing low-carb who wishes to get their carb amount to 0.

0
0bfd9ce9f4ddba32f1b64b48b9360820

(0)

on August 16, 2013
at 09:03 AM

I am on day 18 of a juice fast. I only weigh myself every five days but on day 15 I had lost 15 lbs. I have upped the anti with my excersise this week and run 3 times a week and cycle once. I feel great, full of energy (slightly wired) and will get back into weights as well next week. I want to lose another 21 lbs but its my birthday on the 9th September and I am going to break my fast and spend the day in mcdonalds!

0
705e66484ed64fe8e188123de398413e

on January 02, 2013
at 06:57 AM

I tried a little juicing after seeing Fat, Sick and Nearly Dead which is a really excellent movie. If you've seen it, try to imagine the obese trucker. Was his transition to juicing easier or harder than a transition to a 100% paleo diet would have been?

Juicing is definitely not paleo, but I think there are some advantages of giving it a try as a stepping stone to a real food diet.

Ketosis is not the goal here. Weight loss (likely fat AND muscle) is achieved through calorie restriction and not through ketosis.

0
1dc24e3b9e77e9126200f9c75aecb5c0

on January 02, 2013
at 04:46 AM

I myself was skeptical on the juice fast/feast thing. Seeing Fat, Sick and Nearly Dead motivated me to give it a try. I've lost 12 pounds in 10 days juicing mostly veggies but with some fruits at times. After 7 days I ate about 1/4 cup of cooked pinto beans with onion just to give my bowels something to do. I haven't even started exercising yet. I think as far as the detox stuff which sounds so hooey because our bodies do that anyway, I have to admit I've completely lost my craving for junk food like chips, candy bars, and especially fast food. It was difficult the first 2-3 days, but I blame this primarily on my addiction to MSG which as we know, is in EVERYTHING! Damn food industry hiding it under things like Yeast Extract. Sounds so damn harmless. Anyway, I'll be breaking my fast with a nice pot of water and a juicy bone soon!!

0
B25a8cb2c182fd259b95ac0cba88b0d6

on August 23, 2012
at 10:40 PM

My friend is doing a modified juice fast, with one small solid meal at night. That meal is mostly fish or meat, but with some vegetable and sometimes even some bread. His morning juice has some fruit in it, the rest of the day he juices only vegetables. He tested his urine and came up moderate for ketones.

0
E0250b1e6dc5ec1539ffb745042b4d80

(3651)

on March 02, 2012
at 03:28 PM

It's woo nonsense, kinda like homeopathy.

If someone comes at you with a "cleanse," hit them with your club and go trap a rabbit and eat it.

To be fair, enough people swear by it that something is going on, but I really doubt if the official explanation is valid. Maybe juice fasting "works" because its not beer and pizza, and the rest is hippy woo woo.

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