Juicing: Healthy Habit or Blood Sugar Bomb?

Lots of people are juicing for health and it can be a good way to get more vegetable nutrition.  But could it be doing a number on your blood sugar? Nutrition Diva weighs the pros and cons.

Monica Reinagel, MS, LD/N, CNS
5-minute read
Episode #247

What Does Fresh Juice Do to Your Blood Sugar?

Let's say that Michael's fresh juice contains all of the fruits and vegetables he mentioned, in roughly equal amounts.  Taking into account the fact that some of the sugar will be left behind in the pulp, we could guess that each 16-ounce serving would have about 38 grams of sugar, which is the amount in a 12-ounce can of Coca-Cola.  Unfortunately, your glucose receptors and pancreas don't really distinguish between the sugars in juice and the sugars in soda. My quick and dirty analysis suggests that drinking 16 ounces of fresh fruit and vegetable juice every 3-4 hours without any other food could definitely lead to some major blood sugar surges.  

But hold on: Unlike the sugar in a Coke, the sugar in the juice is completely natural. It's also accompanied by huge amounts of nutrients. After all, it takes at least a dozen servings of fruits and vegetables to produce a 16-ounce glass of juice! Surely all of that great nutrition would offset that pesky sugar issue!

Or would it..?

Many of the nutrients you're getting from fruits and veggies are antioxidants. Antioxidants are great but there's a limit to how much your body can actually utilize at one time. While there is a lot of evidence to support the idea that 5 servings of vegetables a day keeps you healthy, there's little evidence to suggest that 50 servings a day keeps you any healthier. In fact, there's some evidence to suggest that you can get too much of a good thing. 

See also: Can You Get Too Many Antioxidants?

Where's the Balance? 

Fresh juice is nutritious, but it's not balanced nutrition. 

There's another thing that concerns me about relying on juice as a major source of your calories, particularly on an ongoing basis. Fresh juice is nutritious but it's not balanced nutrition.  While it's high in antioxidants and certain minerals (as well as sugar), it's quite low in protein, fiber, and essential fatty acids - nutrients that your body also needs.  If you are drinking nothing but juice for several meals a day, your diet could be low in other important nutrients.

How to Get the Most Out of Juice

If you really love the taste, or you're convinced that fresh juice is making your life better, here are a few suggestions for maximizing your returns and minimizing any downside.

  1. Enjoy juice in moderation.  There's nothing wrong with enjoying a glass of fresh juice on a daily basis but 8-12 ounces a day is probably plenty. (I recommend limiting straight fruit juice to 4 ounces a day.) 
  2. Enjoy juice with other healthy foods.  Adding foods that contain fiber, healthy fats, and/or protein will not only round out the meal nutritionally, but will also slow the absorption of sugars from the juice. When it comes to digesting sugar, slower is generally better. Nuts or nut butter, whole grains, Greek yogurt, avocado, olive oil, fish, and/or whole fruits and vegetables would all be good complements to fresh juice.
  3. Enjoy juice after your work out.  If you're convinced that drinking the juice all by itself delivers additional benefits, consume it during or immediately after exercise, when it is less likely to cause a blood sugar spike.
  4. Try making "whole juice."  High-powered blenders can emulsify, or reduce, whole fruits and vegetables to a smoothie-like texture and retain the fiber.  You can also add yogurt or flaxseeds for more balanced nutrition.

See also: How to Make the Perfect Smoothie


Thanks to Michael for his great question. If you have a topic you'd like me to address in a future podcast or newsletter, send an email to nutrition@quickanddirtytips.com or post it on the Nutrition Diva Facebook page. I always love to hear from you! 


About the Author

Monica Reinagel, MS, LD/N, CNS

Monica Reinagel is a board-certified licensed nutritionist, author, and the creator of one of iTunes' most highly ranked health and fitness podcasts. Her advice is regularly featured on the TODAY show, Dr. Oz, NPR, and in the nation's leading newspapers, magazines, and websites. Do you have a nutrition question? Call the Nutrition Diva listener line at 443-961-6206. Your question could be featured on the show.