Good Measure Meals Healthy ConnectionsMaybe You’re Feeling Foggy Because You Need Carbs - Good Measure Meals Healthy Connections

Maybe You’re Feeling Foggy Because You Need Carbs

Guest Post By: Olivia Bubri, Dietetic Intern

“Carbs are the enemy.”

“Carbs make me gain weight.”

“I don’t actually need carbs, right?”

Whether you’ve read it in a magazine, seen it on television, or heard it from your neighbor, everyone’s got something to say about carbs. So what’s the actual science behind these claims and what do we need carbs for anyway?

The Science Behind Carbs
Now, let’s talk about carbs. Carbohydrates, otherwise known as carbs, are the body’s primary energy source. And no, we’re not talking about pastries, cookies or cake kind of carbs.

We’re talking about complex carbs – the ones that come from whole foods such as fruits, vegetables, beans, whole grains, and dairy products. These carbs naturally include other added benefits such as dietary fiber, vitamins, and minerals.

Carbs are broken down into glucose and are then used as fuel. It’s actually easier for our body to get glucose from carbohydrates when compared to fat or protein. Not only that, but our brains specifically prefer glucose as their main source of energy.

When you continue to eat a low-carbohydrate diet, you may start to notice symptoms of low blood glucose, which is basically your body screaming for fuel. In fact, the carbs in our diet help keep our blood glucose levels within a healthy range, which is essential to provide energy for all of our cells and especially our brains.

When we haven’t eaten for several hours, our blood glucose levels tend to drop and our body will begin to rely on glycogen, or stored glucose, as a source of energy. However, these additional stores may be depleted more quickly when we are not consuming adequate carbohydrates. Feeling lightheaded, dizzy, sluggish, foggy brained, confused or shaky may all be symptoms of low blood glucose.

Balanced Eating is the Key to Success
News flash: our bodies actually love and need carbohydrates. Contrary to popular belief, low-carb diets have not been proven to result in long-term weight loss. This is mostly due to the fact that these diets are unsustainable over time. 

Take a minute to think about your own daily eating patterns. Do you often feel energized and alert or foggy and s l u g g i s h? If you’re constantly falling asleep at your desk or have a hard time concentrating, you may want to consider adding some fiber-rich carbs to your diet. Bonus points if you pair these carbs with lean protein to sustain your energy even longer. Think whole grain crackers with peanut butter, apple slices with string cheese or carrots and a Greek yogurt-based dip.

It’s important to remember that a balanced diet includes a variety of all three macronutrients: carbs, proteins, and lipids/fats. The Institute of Medicine (IOM) has set specific ranges for each, titled the Acceptable Macronutrient Distribution Range.

The IOM recommends:

  • 45-65% of total calories come from carbohydrates
  • 10-35% of total calories come from protein
  • 20-35% of total calories come from fat

However, dietary patterns are not a one-size-fits all solution and these ranges may vary based on your current lifestyle and medical history. Meeting with a GMM Registered Dietitian Nutritionist may help you create an eating pattern that works best for you.   

This post was created by Olivia Bubri, Dietetic Intern



  1. Scientific Report of the Dietary Guidelines Advisory Committee.; February 2015.
  2. 2005 DGAC report – Part D. Science Base, Sect. 5. Carbohydrates. 2005 DGAC report – Part D. Science Base, Sect. 5. Carbohydrates. Accessed January 30, 2017.
  3. Hypoglycemia – National Library of Medicine – PubMed Health. National Center for Biotechnology Information. Accessed January 30, 2017.
  4. Carbohydrates: How carbs fit into a healthy diet. Mayo Clinic. Accessed January 30, 2017.
  5. Office of Dietary Supplements – Nutrient Recommendations: Dietary Reference Intakes (DRI). National Institutes of Health. Accessed January 30, 2017.



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