How to Make My Smoothie More Filling: Fruit and vegetable smoothies are healthy, but they won't keep you full throughout the day. The best way to make your smoothies more filling is to add...
3 min read

How to make filling smoothies

Audrey Herndon | Jul 23 2020 | Tags: Smoothie Tips & Tricks, Health & Wellness

Nothing is more refreshing than a fruit smoothie first thing in the morning.  But why is it that about 30 minutes later, your stomach is grumbling for more food? You can shove as many fruits and veggies into your blender as you desire you're going to be left feeling hungry and unsatisfied. As healthy and delicious as fruits and vegetables are, they just do not provide enough substance to keep you feeling satiated throughout the morning. What can I add to my smoothie to make me feel full longer?

The best way to make your smoothies more filling is to add protein.

The easiest thing about this is that protein comes in many different powders, so you are able to spice up your smoothie to your liking. However, adding protein powders to smoothies is not everyone's cup of tea. Some people find that it alters the flavor in a strange way and takes away from the fresh feeling of sipping on natural ingredients. Luckily, there are alternative food sources that provide the same nourishment, with a different flavor. The most tasty and common protein sources to add to smoothies are nut butters, oats, seeds (chia, hemp, flax, pumpkin), greek yogurt, milk, and collagen.

What can I add to my smoothie to make me feel full longer?

All these ingredients contain at least 5 grams of protein per serving which is a good starting amount if you are looking to have filling smoothies as meal replacements. Evidence from the Purdue Investigative Research Center suggests that protein activates a satiety hormone release, meaning a hormone release in your body that signals to your brain that you feel full.

Adding protein to smoothies also helps slow down the digestion process, leaving your stomach feeling full because the smoothie is taking longer to work its way through the digestive system.

A helpful ratio to stick to when making filling smoothies is one cup of fruit/vegetable, to two cups of protein. In SmoothieBox smoothies, the protein is already provided for you, but you also have the opportunity to add in your own protein sources if you feel the need to (such as blending with milk as opposed to using water).

SmoothieBox smoothies are formulated with this science in mind. Our Super Smoothie recipes include protein that helps your body feel satisfied.

Overall, there are many different ingredients that you can sneak into your smoothies to help turn them into a complete meal to fuel your body. While protein does help you feel full, it also provides your body with energy and nutrients that help you take on the day. Next time you want to make a filling smoothie, experiment with adding protein and experience the huge difference that it makes.



Miller, Korin. (2016, May 13). This Is Why You're Always Still Hungry After Drinking A Smoothie (And How To Do Smoothies Right)

Preidt, Robert. (2016, March 3). Protein-Heavy Meals Make You Feel Fuller, Sooner. WebMD.

Shanker, Deena. (2014, March 20). “17 Ways To Add Protein To Your Smoothies Without Using Chemical Powders.”

Did you like this article? Why not share it ...

Send this article to a friend and tag SmoothieBox on Facebook and Instagram!


Audrey is a summer intern for SmoothieBox working in the marketing and social media department. She is a rising junior at Elon University with a marketing major and strong passion for health, wellness and fitness! In her free time you can find her going for a run or at the beach with friends.

Leave us a comment



Blending up smoothies and good vibes




Join thousands of others and start your day with a breakfast you can feel good about.

Get Started

Ready to get started?

Delivered straight to your door, pre-portioned and ready to blend, you'll be on your way with nutritious Smoothies in minutes.

Get Started