Why is my Smoothie Frothy? (Plus 9 Smoothie Problems and Fixes)

reasons for a frothy smoothie

Are your smoothies too foamy? A good smoothie should be smooth and nutritious. It should have an excellent balance of solids and liquids. Other qualities to look out for include color, flavor, and acidity.

The texture of a smoothie should not be too gritty, too thick, or watery. A foamy smoothie can cause burping and lower your appetite. The foam also takes up space in your cup thus reducing the quantity of real product in the cup.

This article discusses the cause of froth in a smoothie and how to reduce the foam. There is also a section for the common mistakes when making smoothies and how to fix them.

Why is my Smoothie so Frothy?

The main reasons for a frothy smoothie are insoluble fiber and blending at high speed. Your smoothie is likely to be foamy if you blend large portions of fruits and veggies that are rich in insoluble fiber such as leafy greens, apples, and pineapples. Similarly, high-speed blending whips more air into bubbles in a smoothie.

Although a smoothie that is too foamy is unappetizing, you should not discard it as it’s not gone bad. You can remove the foam by trapping it with a spoon or scoop it out and enjoy the drink. The only problem with removing the foam is that you lose some nutrients in the foam.

To avoid losing the nutrients people simply stir the foam and mix it into the drink. You can dissolve the froth by adding canola or coconut oil and blending the smoothie for 10-20 seconds at low speed.

How to Prevent a Smoothie from Frothing

Insoluble fiber is essential to our bodies as it promotes bowel movements so we should incorporate insoluble fiber-rich fruits and vegetables in our smoothies.

Insoluble fiber is usually on the skin of fruits and vegetables. Leafy veggies such as collards, kale, and spinach are excellent sources of insoluble fiber.

Here are a few tips to prevent a smoothie from foaming.

  1. Blend on the lowest speed setting to avoid adding a lot of air to the smoothie
  2. Add soluble-fiber-rich ingredients to balance insoluble fiber. Soluble fiber improves creaminess and binds a smoothie into a uniform texture.
  3. Use frozen fruits and vegetables
  4. Blend small portions of the ingredients that are rich in insoluble fiber at a time to avoid foaming
  5. Pulse the blender towards the end of a blending cycle to get rid of some of the foam and bubbles
  6. Add healthy fats such as flax oil or coconut oil to remove bubbles and dissolve the froth

9 Common Smoothie Mistakes to Avoid

There is a lot more to making a smoothie than just tossing some fruits and vegetables in a blender and whirring away. There are a few mistakes to avoid when making a smoothie.

1. Browning

Smoothies tend to brown as a result of oxygen interacting with the individual fruits and vegetables in the smoothie. Some fruits and vegetables such as apples and avocados brown faster than others.

You can reduce browning by adding a teaspoon of vinegar or a few drops of lemon or lime juice when blending.

2. Avoid Chunky Smoothies

Sometimes leafy vegetables such as kale and spinach are not fully blended and may leave chunks on the walls of the blender or in the smoothie. To avoid this, blend leafy vegetables separately and then add the other ingredients to make a uniform consistency.

3. Load the Blender Correctly

Loading the ingredients into a blender in the correct order will prevent solids from getting trapped in the blender blades. Always add liquids first followed by the chopped ingredients and lastly the larger components such as ice cubes. Before running the blender, use a spatula to move the ingredients around to avoid clogging the blades.

4. Adding Artificial Sweeteners and Free Sugar

Fruits and vegetables have natural sugar. Artificial sweeteners are linked with health risks so you are better off sweetening a smoothie with natural fruits such as bananas and dried raisins.

Here is an interesting read about whether blending fruits increases calories.

5. A Smoothie that is too Thick

A smoothie that is too thick is unpleasant and difficult to drink. Using plenty of ice or large quantities of fruits and vegetables can cause a smoothie to be too thick.

You can thin a smoothie that is too thick by adding liquids such as water, milk, or juice and reblending it.

6. A Watery Smoothie

A watery smoothie is caused by adding too much liquid, using insufficient portions of fruits and vegetables, or very little ice. To thicken a watery smoothie, add ice or more fruits and vegetables.

Making a smoothie with frozen fruits and vegetables will also overcome wateriness.

7. A Gritty Smoothie

Dry ingredients such as nuts and seeds can yield a smoothie that is too gritty and undrinkable. You can strain such a smoothie to remove the gritty elements.

8. Smoothie Separation

Most smoothies separate if they sit over a long period of time. A thin smoothie is more likely to separate than a thicker smoothie. Ingredients that are rich in insoluble fiber do not mix very well and cause smoothies to separate.

To prevent smoothie separation, add more soluble fiber-rich fruits such as bananas to thicken and improve the texture of the smoothie.

If a smoothie is already separated but has not gone bad, stir it or briefly blend it again before drinking.

9. Use Ripe Fruits

Unripe fruits are hard to blend and can cause overheating. When the blender blades overheat, they can ruin some nutrients in the smoothie.

Unripe fruits are also likely to be tarty and less nutritious. Nutrients such as antioxidants, natural sugar, minerals, and vitamins increase with the ripening of fruits.

Final Thoughts

A smoothie with a lot of froth is unappetizing and can cause burping. The main reasons for a foamy smoothie are insoluble fiber and the incorporation of a lot of air from high-speed blending.

There is no need to discard a smoothie that is too foamy as you can scoop out the foam or trap it with a spoon when pouring. Alternatively, mix the foam back by stirring or add coconut oil and pulse the smoothie in a blender to dissolve the foam.


Patrick is first a coffee lover and then a trained barista. His bucket list includes sky diving and sipping on Java in the Himalayas.

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