May 17, 2018

The Truth about Smoothies – Friend or Foe of Weight Loss?

By Rachel Wyman
Clinical Nutritionist Educator

Health clubs, gyms and organic grocery stores sell them. Exercise infomercials promote them. Smoothie detoxes and cleanses are all over Pinterest. So what’s the truth about smoothies and their impact on weight loss?

If you’re not careful, smoothies can actually promote weight gain rather than weight loss. In order to be an effective part of your weight-loss plan, you’ll need to pay careful attention to ingredient selection, portions and strategic placement of smoothies into your daily meal structure.

Avoid these ingredients

Calorie-dense ingredients to use cautiously or avoid include: nut/seed butters, plant oils like coconut or hemp oil, avocado, fruit juices, agave nectar, coconut milk, coconut water, flavored syrups, sherbet, frozen yogurt, granola and honey. These ingredients can turn a 150-200 calorie shake into a 400-500 calorie shake.

Portion control

It’s also important to be mindful about portion sizes. Liquid calories can be easier to overconsume than solid food calories. Liquid meals empty more rapidly out of the stomach than solid meals, and larger volumes of liquid calories empty faster compared with smaller volumes. Avoid the 44-ounce smoothie – it could be your entire days’ worth of calories, but leave you hungry again within 1-2 hours!

Retail smoothie stores

Two popular smoothie chains, Planet Smoothie and Smoothie King, sell a wide variety of options. Review the nutritional information on their websites to make an advanced informed choice. For example, at Smoothie King, the 20-ounce Hulk Strawberry smoothie contains 910 calories, 27 grams of fat and 127 grams of sugar compared to the 20-ounce Slim-N-Trim Strawberry smoothie, which contains 240 calories, 2 grams of fat and 38 grams of sugar. The former won’t help you reach your weight-loss goals, while the latter is a healthier choice.

Some local specialty/nonchain smoothie or juice cafes do not publish their nutritional information, so it can be difficult to know what you are actually getting. Similarly to cooking at home versus eating out at restaurants, making your own smoothies can be a great way to control calories and nutrition.

Replace a meal, not a drink

To avoid weight gain, a smoothie should replace a meal or snack, not a beverage. A smoothie prepared with quality ingredients – healthy high-fiber carbohydrates like berries and leafy greens, a lean protein source like fat-free Greek yogurt or silken tofu, and a healthy fat source like a teaspoon of chia or flax seed – can support weight loss when used to replace a skipped meal or high-calorie meal.

Rachel Wyman, RD, is a Clinical Nutrition Educator at Mission Weight Management.

To learn more about Mission Weight Management and to sign up for a free information session, call (828) 213-4100 or visit