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I've been making a lot of green smoothies (using a Vitamix), and they have a tendency to end up with about 2 inches of undrinkable froth/foam at the top. It seems a higher percentage of veggies vs fruit makes it worse, and spinach is particularly bad.

2 questions:

What causes this? (my wife suspects it has to do with the fiber not breaking down -- which seems plausible, but it's just a guess)

And what can we do to prevent it? Is there anything we can add to get them to more fully integrate?

A sample recipe, if it helps:

  • 1-2 handfuls spinach
  • 1 apple
  • 1" piece ginger
  • 1 persian cucumber
  • 1 stalk celery
  • juice of 1 lemon
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3 Answers 3

up vote 4 down vote accepted

As Catohound already mentioned, it's a symptom of using a high speed blender. You may find this technique useful.

Tcrn the blender to its lowest setting and then slowly ramp it up until the top of the liquid just starts to circulate (usually around speed 4 or 5 on a Vitamix). As you run it at this low speed, you will see bubbles coming out in the center.

My wife and I do this with our Vitamix and it generally gives good results.

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2  
This would be a better answer if you summarized the technique rather than just linking to it. –  KatieK Nov 8 '13 at 23:31
    
All right. I updated my answer with a relevant quote from the link. –  Scruffy Nov 9 '13 at 20:58
    
The video from that link is especially helpful for seeing the technique (and, tried it this morning and got nearly the same result, and a much better smoothie). Accepted. –  Jeremy Nikolai Nov 10 '13 at 17:11
    
Glad I could help! Enjoy your smoothie. :) –  Scruffy Nov 10 '13 at 21:12

I don't know how to solve it once it's happened, but it's caused by the high speed of your blender. I use an Oster blender and never have froth in my green smoothies, so maybe trying a different blender will prevent it. If you juice greens they get frothy, so it's not the fibre NOT breaking down - maybe the opposite. Pulsing the blender a few times at the end might get rid of some of the froth. I always pulse a few times at the end to get some of the incorporated air out of my smoothies. High speed blenders incorporate a lot more air than my blender does, though. Not sure if that'll cut it for you.

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Add a tablespoon or two of chia seeds - they magically eliminate the froth.

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Really? Chia seeds? –  Jolenealaska Jul 3 at 6:39
1  
Add before or after blending? –  Chris Steinbach Jul 3 at 17:35

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