Lets take A Closer Look At Carbohydrates


Carbohydrates are one of the three main macronutrients; the others are protein and fat.

Carbohydrates are biomolecules or saccharides, in simple terms, carbohydrates are sugars. In order to understand how the Ketogenic diet works, it is important to understand carbohydrates and what they do inside the body.

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Types Of Carbohydrates

There are two types of carbs, traditionally classified as simple and complex.

Simple Carbohydrates

Simple carbs are those made from only one or two sugar (saccharide) chains. All simple sugars and starches are converted to glucose in the body, except sugar alcohols and insoluble fiber.

Types Of Simple Sugars

  • Sucrose is table sugar or cane sugar and all items made with it
  • Glucose is found in some fruits and starchy vegetables
  • Fructose is the sugar in all fruits and honey and is also used to make many processed food products because of its high level of sweetness
  • Galactose is the sugar that occurs naturally in dairy, like milk and yogurt

Naturally occurring sugars are those found naturally in a food or in the ingredients used to make a food, for example fruit, milk and vegetables.

Added sugars refer to those added during cooking or manufacturing, and include, corn syrup, honey, or table sugar. Table sugar and many things made with it are considered to be an empty calorie food that serves absolutely no nutritional benefits in the body.

Simple Carbohydrates Include: non-starchy vegetables, candy, table sugar and anything made from it, soda, white flour, juices, fruit, milk, honey and syrup just to name a few.

With the exception of non-starchy vegetable, simple carbs require no break down as they enter the body to be absorbed so they digest quickly to flood the bloodstream with glucose, causing insulin spikes to occur.

This process triggers the release of insulin from the pancreas, which sends food to cells, and any leftover sugar is stored as fat, which contributes to weight gain and obesity.


Simple sugars are insulin triggers that can promote weight gain and increase risk factors for type 2 diabetes

The constant stimulation of the production of insulin may and does at epidemic levels in the United States, eventually lead to insulin resistance, a condition known as type 2 diabetes.

Complex Carbohydrates

Complex carbs are made up of thousands of sugar chains hence the name complex.

Complex Carbohydrates: any starch including but not limited to corn, potatoes, beans, rice, grains, cereals, and bread.


Ketogenic diet principles propose that complex carbs  are insulin triggers that provide the body with a fuel source that can and does turn to stored fat (glucose).

While some may argue that complex carbs are “better” than simple carbs, low carb diets, like the Ketogenic take a different viewpoint, which is that both simple and complex carbs are insulin triggers that provide the body with a fuel source that can turn to stored fat (glucose).

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Glycemic Load

Doctors and other researchers in the Harvard Nurses Health Study found that baked potatoes and cold cereal were foods that contributed most to increasing blood sugar levels to an unacceptable level, known as “glycemic load.”

The Nurses’ Health Study both part 1 and part 2 is the largest epidemiological study conducted in the US into the risk factors for major chronic diseases in women and has been going strong since 1976.

75,521 women aged 38 to 63 who had no previous diagnosis of diabetes, angina, myocardial infarction, stroke, or any other cardiovascular conditions were followed for ten years (Liu, S., Willett, W.C., Stampfer, M.J., et al).


Researchers found that those carbs classified as high by the glycemic index, instead of the traditional classification of either “simple” or “complex” were better predictors of cardiovascular disease risks

During the 10 year follow up, the study documented 761 cases of coronary heart disease, 208 of which were fatal and 553 nonfatal, and dietary glycemic load was directly associated with risk of cardiovascular heart disease even when adjustments for smoking status, age, and total caloric intake and other risk factors for heart disease were accounted for.

The Glycemic Index

The Glycemic Index (GI) is a scale of 1 to 100 that measures a food’s impact on raising blood sugars or its glycemic load. The higher the score a food has the higher the glycemic load.

Simple Versus Complex Carb on the GI Scale

  • A white potato without skin has a GI of 98, while one raw apple has a 34 GI

The potato is considered a complex carb, while the apple is considered to be a simple carb.

Any foods that are considered to cause significant insulin release will typically be high on the GI scale.

Carbs And Ketosis


Any glucose not used for energy, will be stored by the body as fat. Conversely, once those sources of glucose are eliminated, namely carbs, the body can turn to fat stores for energy and enter ketosis, which burns fat for energy instead

All carbs, both simple and complex convert to glucose in the body, which is then used as fuel and energy for cells and other organs inside the body.

Sugar Alcohols

In general, sugar alcohols are not insulin triggers and they do not count as impact carbs, but some do have a higher GI than others and should be considered carefully and monitored for their effect on your individual results.

Individual results can vary as to the digestion of sugar alcohols depending upon an individual’s gut enzymes and how the sweeteners are consumed.

Sugar Alcohol Glycemic Index
Maltitol 36
Xylitol 13
Sorbitol 9
Glycerol 3
Isomalt 2
Mannitol 0