Q&A: Fruit Juices

Here’s an interesting question from a reader who must have read my post, “Q&A: What Do I Drink?

Q: Hi!  I am new to the Paleo diet.  My CrossFit gym just finished a 30 day challenge (I lost 9 pounds and 3% body fat during the month of April – whoa!), and I was wondering why you suggest only drinking fruit juice that you have made at home?  If it’s 100% juice, it’s still not ok?  Is there a certain brand that is better than others? (ie Naked Juice)

A: The reason the Paleo diet doesn’t really allow for fruit juices is because they are usually loaded with extra, added sugars and other weird ingredients like preservatives, colorings and synthetic flavorings.  As we all know, the extra sugars wreak havoc on our blood sugar levels, creating blood sugar crashes and spikes, as well as the inner tube on your mid section.

Beyond that, though, when you juice something, unless you drink it very soon after juicing it, you lose a LOT of the nutrients.  Oxygen damages the juice if it sits out for too long, just like a sliced apple turns brown if it sits out.  Think of packaged juices (and home made juice that sits out for too long) like you think of brown apples.  Ew.

I’m honestly not a big fan of juice at all.  I suggested people drink freshly juiced juice on that post because I know that people have an obsession with overly sweet beverages, and it’s a better alternative than soda (sometimes).  I don’t think you need juice, unless you’re absolutely trying to gain weight on the Paleo diet or something.  If you must have juice, here’s why I think you should make it yourself at home:

1) Because we often have compromised digestive systems from eating crappy foods our whole lives, the juice is easier to digest, so it’s easier on our whole bodies.

2) The juice we make at home can be from local, organic, unadulterated fruits and vegetables that don’t have any weird chemicals or extra sugars added to them. Even when store bought juices don’t have added sugar, they’re still loaded with it.  For instance, your 16 ounce Acai Naked juice (no sugar added) has about 48 grams of sugar in one bottle.  That’s more than a 12 oz can of Coke (39 grams).  Even the “veggie” Naked juice has 36 grams.  (By the way, that 16 ounce Acai Machine Naked drink contains 320 calories if you drink the whole thing.)

3) Fresh, homemade juice is full of nutrients and enzymes that packaged juices just don’t contain. That’s why they have to ADD vitamins and other nutrients to the juices (check out your Naked juice label here for proof).  Manufacturers are required to pasteurize (heat) juices, including Naked and other similar brands.  That means you lose a lot of the beneficial enzymatic properties of the juice, and many of the other vitamins are diminished, as well.  So besides the fact that the juice is definitely NOT fresh, it’s also blasted with heat, not to mention irradiated a lot of the time if it’s not organic.

4) Unless you have a very large refrigerator in which to store all of that produce, a high tolerance for laborious clean-up, and a LOT of money, the amount of juice you make at home sort of regulates itself. You’re probably not going to be making a 16 oz glass of fresh fruit juice every day at home because it would cost you like $15 a day if you did.  The reason you can buy a Naked juice for $3 is that the first ingredient in a lot of their juices is apple juice concentrate.  Conventional apples, by the way are one of the 12 most highly chemically sprayed fruits out there.

5) You don’t often find vegetable juice in stores (besides V8, but that doesn’t really count because it’s pasteurized, not organic, and full of iodized salt).  But you can sure juice your own vegetables at home.  Veggies are way lower in sugar than fruits, and chock full of nutrients. Which brings me to the down sides of juicing even at home.

Here’s What’s Bad About Any Juice
Even though freshly juiced juice has all the benefits of the nutrients and enzymes that we just discussed, fruit juice is a really high glycemic substance.  That means it can cause a sharp blood sugar spike (which is why you see type 1 diabetics in movies desperately needing a glass of, yes, fruit juice when they have a sugar crash).  It can have terrible effects on type 2 diabetics, people trying to lose weight, kids (and adults) with behavioral issues, and people who are just trying to get through their day without getting on a blood sugar roller coaster.

When you juice a fruit and remove all of the pith, you’re also removing the fiber and starches, which act as a buffer to your blood sugar levels from all that sugar. The fiber also makes you feel full, unlike a glass of fruit juice, which just makes you feel like flying.  That’s why you can stuff 5 blackberries, 4 raspberries, 4 strawberries, 3 1/2 apples and 1/2 banana into the 16 oz Naked Berry Blast and not feel satiated.  If I ate 3 1/2 whole apples I would explode – I don’t know about you…

When you juice vegetables, you’re still not getting that beneficial fiber, but vegetable juice has way less of an effect on your blood sugar and insulin levels than fruit juice, except for beets and carrots, which act similarly to fruits.

Eat Fruit Instead
Sooo, if you’re in the mood for juice, first consider eating a piece of fruit.  If you still want the juice and all you have access to is store-bought, pasteurized juice, at least make it organic.  And even then, water it down.

If you can make your own juice at home, first consider, instead, eating that expensive fruit (unless your digestion just can’t handle it).  If you still want the juice, make sure you put some vegetables in your juicer along with the fruit to decrease the glycemic response.  Celery, spinach, and even kale are surprisingly sweet when you juice them.

The Worst and the Best Brands
To answer your question about whether or not there are brands of juice that are better than others, yes, of course there are.  Naked is probably one of the better ones, but that doesn’t mean that as a nutritionist I would ever advise someone to drink it. It is NOT organic and all of the flavors are really sugary, like I already pointed out.  The worst brands you could probably drink are the “Light” kinds, which are usually sweetened with Splenda or aspartame, or some other profoundly malevolent substance.  Just look on the ingredient list for sugars, things that you don’t recognize, and look for the word “organic” before every single fruit they list on the ingredients.  Even if the label on the front claims it’s an organic product, it doesn’t necessarily mean that all, or even most, of the ingredients are actually organic.  Check the ingredient list.

Through the Paleo Lens
In the end, I like to ask myself, “Could I have eaten this thing in front of me if I were a hunter gatherer?”  Maybe they would take the time to gather and mash up enough fruit and vegetables to make one glass (clay jar, whatever) of juice, but I’m going to guess that’s not normally what happened.  In my last post I talked about the Inuit people, and how in the summer time they harvested berries and froze them to preserve them for the winter.  I’m laughing to myself right now thinking about them squeezing the juice out of the berries and leaving the pulp for the birds.  Fruit, in many hunter gatherer societies, was a treasured treat – there was no reason to waste any part of it, and our bodies adapted to that in that we don’t handle straight sugar well; we’re designed to take it in with the fiber and other nutrients that make up that sweet little package that is fruit.


  1. Neely, nice article about juices. This is one of the more common questions I get about the Paleo Diet. “well it’s natural so doesn’t that make it ok?” not really… Do you think smoothies would be an acceptable substitute, assuming they’re made with fresh fruit?

    1. Yes, I do think that smoothies are a better option, since you’re still getting all of the fiber from the fruits AND blending things usually makes them easier to digest. You can still pack a whole lot of fruit and sugar into a smoothie, though, so just watch out if you’re trying to lose weight.

  2. You realize that the calorie and sugar content are also present in the raw fruit, right? The reason those are so high is that they puree a lot of fruit into a small container. An apple has about 80 calories, almost all of which are sugar, meaning roughly 20 gram. Two apples are 40g sugar and 160 calories, less than a can of Pepsi, so according to that logic the Pepsi is healthier? What?

    1. Hi Zach – Yes, I do realize that the calorie and sugar content are also present in the raw fruit. The difference between two apples and a can of Pepsi is that the Pepsi has absolutely no nutritional value in terms of vitamins and minerals, and it has no fiber to slow the sugar’s entrance into the blood. We’re looking to stop the blood sugar spikes and crashes, and eating an entire apple will help with that because of the fiber, etc. Plus, you’re right when you say they puree “a lot” of fruit into a small container. That means you’re getting the sugar from 3, 4, or more servings of fruit while if you just ate one serving of whole fruit you probably wouldn’t even be hungry for more. Or at least not THAT much more, and that’s because of the fiber and other carbs present in the whole fruit.

  3. i’ve been allergic to raw apples since the age of about 6 and go through phases of drinking apple juice. i buy unfiltered, ‘nothing but apple’ juice as i don’t see why it would need additional sweeteners.i’m not keen to juice my own as even small bits of the raw fruit can make me sick. is this still a bad idea? i do want to lose weight, but i get tired of drinking nothing but water.

  4. I hope you’re still around to answer this question — I understand this is an OLD post but I need a second opinion.

    I am Paleo in that I avoid grains and dairy, but my carbs are generally ketogenic levels (I feel so much better for it).

    I alway start my day with a home made berry smoothie (about 100g of mixed berries cut with water). I consume the everything, pulp and juice with no sugar or anything added. I do this to make greens powder and taurine palatable and it makes me feel good – Although I do get very hot after consuming this (why would this smoothie have a high thermic effect?!). Do you feel like a home made, whole berry smoothie every morning is a bad idea from a health perspective? I have limited carbs from which to derive the most health potential, and the carbs are very low in the smoothie, but yet antioxidants, vitamins and minerals are very high.

    Also, I make my own orange juice (typically 2-3 oranges, filtered) at home and consume immediately post-workout (strength training and sprinting). I do this because I want something that I can prepare really quickly, tastes good (Earn your carbs, it’s a treat, afterall!), and is not grain or dairy based (rice, whey, etc).

    I purposely filter the juice so that it’s completely smooth (so I do not consume the whole fruit…). From the perspective of health and fat loss, would you advise against home-made post-workout juice?

    I understand it’s not what Grok would do, but with out greater knowledge and understanding of diet and nutrition, is there any harm in manipulating insulin at the right time (in this instance, post work out)?

    1. Craig – I really don’t know because it totally depends on your own body. If you’re seeing positive health effects, then by all means keep doing what you’re doing. If you’re seeing the opposite (weight gain, performance decreases, health problems) then start experimenting further.

  5. Thank you for this article! I just went through the cafeteria line and grabbed a Naked Carrot Orange juice. I sat down and, after a short Google search, read your article. I immediately went back and asked to exchange it for a bottles water. There was a cost difference, but that’s the price for my education today. Tha ms again!!

  6. Thank you for this article. Yesterday I had bought a largish bottle of Naked mango juice because I didn’t see any other ingredients besides fruit puree. No added sugar, no preservatives, etc. I agree it probably wasn’t likely that hunters and gatherers didn’t juice their fruit. So after I finish this bottle I will stick to blended fruit cut with water and just water.

    I am new to paleo, are there any other acceptable drinks?

    Also, if you opted to cheat every once in a while with alcohol, are there better alcohol beverages than others? my mom has been paleo for a while as well as crossfit director at her box and said red wine would be best, and to stay away from fruity alcoholic beverages. Can I get your thoughts on it as well?

    1. Lauren – All of these are good questions. So technically, fruit juice is Paleo. However, I only suggest that very active people drink it, especially right before or after a big, long workout because your body will use that sugar up quickly during the workout and it’ll give you energy. So don’t freak out about it in other words. If you really want your juice, go for it, but notice how it affects your blood sugar, your weight, or anything else.

      Read my blog posts on drinks and alcohol:

      Beverages in general: http://www.paleoplan.com/2011/03-11/qa-what-should-i-drink/
      Alcohol: http://www.paleoplan.com/2011/09-01/alcohol-and-paleo/

      That should answer all your questions. I personally drink wine, tequila, mezcal, gin, and spiced rum :)

  7. Also I’m totally laughing and making fun of myself right now. The reason I even found this blog post is because I googled “Is motts apple juice paleo?” Who was I kidding…haha….but seriously, the only ingredients are “WATER, APPLE JUICE CONCENTRATE, ASCORBIC ACID (VITAMIN C)”. So I thought there may be a chance I’d be safe with it (I always mix it half and half with water anyway).

    If after this 30 day challenge were up, and I were to do the “mostly” paleo diet (90% maybe?) Do you think 100% fruit juices cut in half with water are detrimental so long as there’s no added sugar, corn syrup, preservatives, etc?

    thank you!

  8. I was just wondering. If I wanted to make a smoothie what could I use since Dairy Products arent part of the paleo diet. Is Coconut Milk or Almond Milk a good substitute?

  9. I’m new to the Paleo way of life. If I have to give up my glass of Tropicana 50 every morning, so be it. I can substitute a navel orange. My question is: What about Matcha tea?

    1. Laura,

      Welcome to Paleo! So glad you’re giving it a try! Matcha tea is an excellent choice of beverage for a Paleo (or any) diet! It’s finely ground green tea leaves, so it’s super full of antioxidants! Plus, you could blend it with an orange, or any other form of fruit, and make a delicious matcha smoothie! You can even blend it with coconut water and chia seeds, and get a super-hydrating beverage that’s perfect for the summer. Really, there is no limit to the way you can experiment!

      If you have any more questions, feel free to email me!

      Aimee McNew, MNT, Certified Nutritionist

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