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What's the difference between impact and non-impact carbs?

Published on: April 23, 2018

Impact carbs are carbohydrates that have a high impact on your blood sugar level. They are also known as high GI carbs (high glycemic index carbs) and are digested rapidly, quickly elevating blood glucose levels [1]. Unless they are immediately used for physical exercise, the excess carbs will be stored as fat – drive by the body’s hormonal response [2]. Refined carbohydrates and sweet foods are naturally higher on the GI scale. Avoid impact carbs unless you want to drop out of ketosis.

Non-impact carbohydrates are low GI carbs (low glycemic index carbs) that are digested at a much slower rate. They don't cause hormonal (insulin) spikes but provide more sustained energy. Vegetables that are packed with fiber naturally are digested slower which makes them a low GI food. On keto, the majority of your carbs should be non-impact.

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