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The Skinny on Smoothies: Use with Caution!

January 23, 2019
The Skinny on Smoothies: Use with Caution! - Lark Health

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Smoothies can be delicious, refreshing, and convenient. They can deliver protein, fiber, and antioxidants. Not only that, but smoothies can also get you to eat a wider variety of vegetables and other superfoods than you might otherwise choose. They could even help you lose weight. But are smoothies healthy?

Smoothies are often the choice for people who are dieting or on a health kick. They are sort of healthy, sometimes. They can deliver the benefits listed above, but they have the potential to go very wrong, too. With just one or two wrong decisions about your smoothies, drinking them can be one of the fastest ways to gain weight and spike your blood sugar.

That is why Lark suggests eating whole foods instead of making smoothies when you can. Here are the red flags of harmful smoothies, ways to keep smoothies from doing damage, and a few recipes to try if you still want to whip up a smoothie every so often.

Smoothie Red Flags

1. Calories

The smallest-sized smoothies from smoothie shops and restaurants tend to have about 200 to 400 calories. A medium or large-sized order can have well over 1,000 calories, which is probably more than half of your daily goal if you are trying to lose weight. Homemade smoothies are not automatically better, though. Concoct a seemingly reasonable blend of banana, peanut butter, vanilla yogurt, honey, and orange juice, and you could also be looking at a mega-meal’s worth of calories.

2. Sugar

Sugar is the biggest source of calories in most smoothies. They can have 50, 100, 200, or even more grams of sugar. In comparison, a can of soda has 35 grams of sugar.

Most of the sugar in smoothies is natural, since it comes from the fruit or fruit juice. Milk and yogurt are also sources of natural sugars. These natural sugars come in a nutritious package – think about fiber and antioxidant from fruit and calcium and protein from milk and yogurt – but they still affect your blood sugar and weight.

Added sugars are worse. They include white sugar, brown sugar, honey, agave syrup, and sugars in flavoring syrups. You might add these sugars to your smoothie directly, or get them from ingredients such as ice cream, flavored yogurt, or sweetened almond milk. Some types of added sugar drive up blood sugar more than others, but they all have an impact on your blood sugar levels, they have calories, and they add no essential nutrients to your smoothie.  

3. Gulping

Have you heard the term, “drinking your calories?” It is not a good thing! It refers to getting your calories in liquid form, like in a smoothie, instead of solid form, as in when you eat whole foods.

Drinking your calories is that it is linked to weight gain. One reason is that your brain takes a while to realize that you are full. By that time, you may already have finished your smoothie and gone back for seconds. Another reason is that drinking is not as satisfying as chewing and swallowing when you eat.

Consider a typical green smoothie with some fruit and protein. You can drink it in a few minutes and may not feel that you ate all that much. Now take those same ingredients and put them on a plate. You might have a green salad with carrot and avocado, an apple with peanut butter, and a container of yogurt. That feels like a full meal!

Smart Smoothie Strategies for Weight Loss and Health

Smoothies may not be the best choice all of the time, but they can fit into your healthy weight control diet occasionally. If you want to have smoothies sometimes, these tips can help you make the most of your choice.

1. Make Your Own

Briefly put, it is easier to avoid a 1,000-calorie sugar bomb when you, not a stranger, are the one making the smoothie. You get to decide what goes in it and how much, so there are no nasty surprises for your waistline or blood sugar levels.

2. Replace, Do Not Add

Your smoothie is the meal or snack, not an addition to whatever you were planning to eat anyway. For most people, keeping snack smoothies to around 100 or 200 calories and limiting meal smoothies to 300 to 500 calories each is the right amount for losing weight.

3. Watch The Liquids

How many perfectly good smoothies have turned into diet disasters with the addition of badly chosen liquids? Juice, juice drinks, sweetened almond and soy milk, and chocolate milk are high in sugar. They can easily double the number of calories in your smoothie when all you were doing was trying to thin it out. Ice, unsweetened nut milk, or a splash of soy milk can give you the consistency you are after without the extra calories.

4. Lower The Glycemic Index

Lower-glycemic foods have less of an effect on your blood sugar. That is good news for your weight, health, and energy levels. You can lower the glycemic index by choosing lower-glycemic fruits, and by adding fiber, protein, and healthy fats.

Lower-glycemic fruits include berries, cherries, apples, pears, oranges, peaches, plums, and grapefruits. Pineapples, bananas, mangos, and figs have a higher glycemic index.

Good sources of protein for smoothies include tofu, plain yogurt, and non-fat cottage cheese. Nuts and seeds add protein, fiber, and healthy fats, and avocados provide fiber and healthy fats. You can add tons of fiber with vegetables.

5. Add Superfoods

Possibly the biggest benefit of smoothies is that they give you the chance to add a better variety of superfoods to your diet. Take advantage! Experiment with all kinds of fresh fruit when it is in season, and use unsweetened frozen fruit when it is not in season. Try leafy green vegetables and a rainbow of other vegetables, such as beets, pumpkin, tomatoes, red and yellow peppers. Some of the best sources of antioxidants are fresh herbs and roots, such as fennel bulb and ginger and turmeric root, as well as dried spices, such as cinnamon and nutmeg. Chia seeds and flaxseed are also worth adding.

I Still Want My Smoothies!

Then go for it! Lark is here to support you in your weight loss and health journey. If smoothies are the right choice for you, then have at it! Here are a couple of recipes to get you going.

Creamy Raspberry Mint Smoothie


  • ¾ cup raspberries
  • ½ cucumber, in pieces
  • ½ cup plain yogurt
  • ¼ avocado
  • ¼ cup unsweetened almond milk
  • 1 tablespoon lime juice
  • A few mint leaves

Blend all ingredients and enjoy!

Peachy Green Smoothie


  • ¾ cup peaches
  • ½ cup tofu
  • 1 cup spinach
  • 1 tablespoon almond butter
  • ½ cup ice
  • ¼ teaspoon cloves
  • ½ teaspoon vanilla extract

Blend all ingredients and enjoy!

About Lark

Lark helps you eat better, move more, stress less, and improve your overall wellness. Lark’s digital coach is available 24/7 on your smartphone to give you personalized tips, recommendations, and motivation to lose weight and prevent chronic conditions like diabetes.

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