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Nutrition & Dieting/Smoothies - good or bad?


Hi. there seems to be an increasing trend to consume smoothies at the moment. I'm aware some natural ingredients are healthier than others, but am wondering whether healthy fatty foods such as nuts, seeds and avocados become rancid after being chopped up in the blender?

From what I've read heat, oxygen and light damage fats - not sure if the chopping action damages the fats contained.

I tend to add nuts, seeds etc. to my smoothies to limit the surge in blood sugar, so just checking I'm not damaging those natural ingredients and me in the process!


Hi Martin,
To answer your question, chopping up foods does not affect their nutritional composition anymore then chewing does.
Fats turn rancid when there left to expose the air for a long period of time. So just consume them within an hour or so and you'll be fine.  

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Laurie Beebe, MS, RD, LD


As a registered dietitian (RD)I am fully qualified to accurately answer questions regarding weight loss, including those from people with health conditions requiring dietary restrictions (diabetes, high blood pressure, high cholesterol, etc) who want to lose weight, or who have been advised to do so by their physician.


I have been a registered dietitian for over 30 years and have a certificate in Adult Weight Management through the commission on dietetic registration at Level 1 and Level 2. I am also trained in coaching through Coach U and currently work as a diet coach to help people lose weight the healthy way, through gradual habit changes.

Academy of Nutrition and Dietetics (AND), Weight Management Dietetic Practice Group, Nutrition Entreprenuers, St.Louis International Coach Federation, Toastmasters

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Bachelor of Health Science from the University of Florida, 1983; Master of Science in Clinical Nutrition from Case Western Reserve University 1985; Certificate in Adult Weight Management 2006; CoachU core essentials grad 2007; Level 2 certificate in Adult Weight Management 2010.

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