Do Smoothies Help With Weight Loss — or Hold You Back?

They can keep you full

The combination of protein and fiber can support weight loss by slowing digestion and reducing feelings of hunger. 

In one study, people who drank a high-protein, high-fiber shake lost more weight over 12 weeks than those given a placebo smoothie with the same number of calories but low in protein and fiber. This is likely because the protein and fiber regulate appetite, increase fullness, and support a healthy metabolism.

They can help stabilize blood sugar

Smoothies may also influence your blood sugar response, which plays a key role in hunger and fat storage. 

A small study of healthy young people found that a smoothie made with apples and blackberries led to a smaller rise in blood sugar than eating the fruits whole. This may be because blending fruit changes the texture of the fiber, potentially making it easier for your body to use. Fiber is key for keeping blood sugar steady. 

They may be tied to other healthy habits

Some of the research that suggests smoothies are good for weight loss because people who drink them often have other health-related behaviors in their lifestyle. For example, a 2024 study found that people who regularly drank fruit and vegetable smoothies tended to have more balanced nutrition and were more physically active. They were also more likely to lose weight than gain it. 

This study doesn’t show that smoothies directly affected health or led to weight loss. But it did suggest that drinking smoothies could be a marker of broader lifestyle habits.

1. Choose the right base

The liquid base for your smoothie shouldn’t add too much sugar or extra calories. Water is a hydrating, zero-calorie option. But there are plenty of other choices that can add helpful nutrients. You can try:

• Coconut water

• Low-fat or whole milk

• Plant-based milks (look for fortified, unsweetened options)

2. Add protein

Adding protein can help you feel satisfied longer and prevent overeating later. Protein also supports metabolism and preserves muscle during weight loss. 

Aim for about 15 g to 30 g of protein per serving. Good options include:

• A scoop of protein powder (15-25 g)

• ½ cup of Greek yogurt (11 g)

• ½ cup of cottage cheese (12 g)

• ¼ cup pumpkin seeds (10.7 g)

• 1 cup of milk (8 g)

• ½ cup of white beans (8.7 g)

3. Include fiber

Fiber plays many roles in your body, including slowing digestion and stabilizing your blood sugar. This can keep you full and prevent energy crashes and cravings later. Fiber also feeds the good bacteria in your gut. This process produces compounds that help regulate body weight, improve insulin sensitivity, and influence fat storage.

Try to include 5 g to 15 g of fiber per serving. Fruit and vegetables are easy ways to add fiber. 

Other examples of high-fiber ingredients are:

• 2 tbsp psyllium husk powder (14 g)

• 1 tbsp chia seeds (5 g)

• 2 tbsp ground flaxseeds (5 g)

4. Add healthy fats

Healthy fats help you feel full and satisfied. They also provide nutrient-dense calories that help to keep blood sugar steady and lower cholesterol — a key part of healthy metabolism.

Adding fat to your smoothie can also make it creamier. But even healthy fats are calorie-dense, so keep an eye on portions. To add fat to a smoothie, try:

• 1 tbsp of almond butter or other nut butter (9 g)

• 1 tbsp of tahini (sesame seed paste) (8 g)

• ¼ of an avocado (7 g)

• 1 tbsp of hemp seeds (5 g)

Putting it all together, an example of a balanced smoothie could be: 

• 1 cup coconut water

• 1 scoop protein powder

• ½ cup raspberries

• 1 cup spinach

• 1 tbsp chia seeds

• 1 tbsp of hemp seeds

Tips 

You’ll also get the most out of your smoothies by:

• Making them at home: This lets you control the ingredients and portions (aim for 8 oz to 12 oz).

• Using smoothies only when you need them: Smoothies can be especially helpful when you need something quick, balanced, and filling. But don’t rely on smoothies as a frequent meal replacement. It’s best to eat whole foods most of the time for the nutrients, chewing satisfaction, and fullness. 

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