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how do you reduce foam in smoothies?

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I use a Vitamix blender to make my smoothies. The last one I made consisted of pineapples, frozen strawberries, carrots, water, juice and protein powder. It made an incredible amount of undiluteable foam consistent with beaten egg whites.

What is the science behind this? How can I make a protein smoothie without this disgusting foam? I may have to mix the protein powder by hand but I prefer not to.

I make a variety of smoothies and can't seem to avoid the foam (from light to egg whitey.)

I don't juice as I want to retain the fiber so any suggestion for my Vitamix would be helpful.

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  1. I also have a Vitamix, it's a leftover from my juice bar. The way I did smoothies was by juicing apples and pears and adding a ripe banana and frozen assorted berries. Sometimes I'd put a little protein powder or some bee pollen. I think the protein powder is probably creating the foam. If you cut out the water and add protein powder at the very end, just to incorporate it, it should work out for you. The Vitamix is quite powerful so you might not want to crank it all the way up.

    1 Reply
    1. re: Lenox637

      Lenox is right about adding the protein at the VERY end. The protein helps the smoothie hold the smoothie/air emulsion that is the foam.

    2. Funny, I recently replaced my decades-old blender with a newer model (Kaloric) and found that it was much more efficient than the old one, but now I have the same problem, even though my smoothies are just yogurt, fruit, and sugar or honey (so I don't think the protein powder is the problem). Now I puree the fruit plus sugar, then add the yogurt and pulse two or three times to mix everything.

      1. Thanks for the tip, going to give it a try.

        1. I would think the trick would be to use frozen fruits. Even if they are fresh freeze them the night before. I would think banana would help prevent foam.

          Lastly, you could do the old Orange Julius trick and throw in a raw egg. That may not keep the foam down but does make it better.

          1. How about pouring the foammy mix in a jar and extract the air form it, There are so many Vacumm pumps in amazon, Some for wine, others for plastic bags, ans there are one or two which connect to jar lids. So I would give it a try.