Resistant starch

Resistant starch

Brief expert definition: What is Resistant Starch, how it works in the body, and how it is applied in sports nutrition.

Short answer: Resistant starch is a carbohydrate that acts like fiber, fermenting in the colon and producing short-chain fatty acids like butyrate, which improves gut health, glycemic control, and satiety. Practical tip: To maintain stable energy levels and better satiety, include at least 6-10 grams of resistant starch daily through foods like cooled potatoes, rice, or green bananas.

Resistant starch is a type of carbohydrate that is partially digested, functioning as fiber in the colon, supporting gut health.

Related reading: the complete guide to proper nutrition — an essential guide from the Sport Zona expert team.

What is resistant starch?

Resistant starch is a type of carbohydrate that is not fully digested and acts like fiber, supporting good gut health.

📖 Resistant starch

Resistant starch is a type of carbohydrate that is not fully absorbed in the small intestine, but ferments in the large intestine, acting as fiber and producing short-chain fatty acids.

Resistant starch (RS) is a category of carbohydrates that, unlike other types of starch, do not undergo standardized enzymatic digestion and absorption in the small intestine. Instead, they functionally behave like soluble dietary fibers, reaching the large intestine unchanged. This distinguishes RS from rapidly digestible carbohydrates, which break down into simple sugars and quickly raise blood sugar.

There are four main types of resistant starch based on their origin and structure: RS1 (physically protected starch in whole grains, seeds, and legumes), RS2 (naturally occurring resistant starch in raw potato, green bananas, and high-amylose corn starch), RS3 (retrograded starch formed by cooling cooked starchy foods like potatoes, rice, and pasta), and RS4 (chemically modified starch created through food processing technologies). Each type has unique physicochemical properties that influence its fermentation and physiological effects.

What are the pros and cons?

The advantages of resistant starch include improving blood sugar control and insulin sensitivity, supporting gut health by increasing beneficial bacteria, providing a prolonged feeling of fullness, aiding in weight management, and reducing the glycemic index and glycemic load of food; the disadvantages are that excessive intake can lead to digestive discomfort such as bloating and gas, effects can vary significantly between individuals, and many benefits are long-term and may not be immediately noticeable.

  • Improves blood sugar control and insulin sensitivity
  • Supports gut health by increasing beneficial bacteria
  • Provides a prolonged feeling of fullness, aiding in weight management
  • Reduces the glycemic index and glycemic load of food

Disadvantages

  • Excessive intake can lead to digestive discomfort such as bloating and gas
  • Effects can vary significantly between individuals
  • Many benefits are long-term and may not be immediately noticeable

Resistant starch exerts its physiological effects through a series of complex mechanisms that begin after it reaches the large intestine. Since it has not been broken down by digestive enzymes like amylase in the upper digestive tract, it becomes available for fermentation by the resident microflora. This fermentation process is key to its benefits.

Bacteria in the large intestine metabolize resistant starch, producing short-chain fatty acids (SCFAs) such as acetate, propionate, and butyrate. Butyrate is particularly important as it serves as a primary energy source for colon cells (colonocytes), supporting their integrity and function. Furthermore, SCFAs have demonstrated anti-inflammatory properties and can influence glucose and fat metabolism throughout the body. Resistant starch works by:

  • Avoiding digestion in the small intestine.
  • Fermentation by the gut microflora in the large intestine.
  • Production of short-chain fatty acids like butyrate.
  • Maintaining gut barrier function and modulating systemic metabolism.

Why is resistant starch important for athletes?

Resistant starch is important for athletes as it offers several key benefits beyond general digestive health, with one of the most significant being its impact on glycemic control.

In addition to glycemic control, resistant starch can contribute to improved satiety (feeling of fullness), which is beneficial for athletes aiming for weight management or adhering to a specific diet. As it ferments slowly in the large intestine, it can provide a sustained feeling of fullness, reducing unwanted calorie intake. The recommended daily intake of fiber, which includes resistant starch, is between 25-38 grams for adults, and including at least 6-10 grams of resistant starch in the daily diet can significantly contribute to these goals. While there are no official recommendations specifically for sports nutrition, the ISSN (International Society of Sports Nutrition) emphasizes the importance of adequate fiber intake for optimizing digestive function and overall athlete health.

What are the related concepts?

  • Glycemic Index (GI) — Resistant starch lowers the overall glycemic index of foods, contributing to more stable blood sugar levels.
  • Glycemic Load (GL) — By slowing down carbohydrate absorption, resistant starch effectively reduces the glycemic load of a meal.
  • Isomaltulose — Isomaltulose, similar to resistant starch, is a carbohydrate with a low glycemic response, providing sustained energy.
  • Fructose — Unlike fructose, which is primarily metabolized in the liver, resistant starch is fermented in the large intestine.

Related concepts include Glycemic Index (GI), which resistant starch lowers, contributing to more stable blood sugar levels, and Glycemic Load (GL), which resistant starch effectively reduces.

Including at least 6-10 grams of resistant starch daily can optimize digestion and support energy balance in athletes. — Petar Mitkov

Remember: Resistant starch is an important carbohydrate that supports gut health and stabilizes energy levels, benefiting both overall health and athletic performance.

Scientific sources

  1. Resistant starch: A review of the health effects, 2013
  2. Health benefits of resistant starch, 2005
  3. Resistant starch: its potential for the prevention and treatment of chronic diseases, 2018
  4. Resistant starch intake affects gut microbiota, bile acid metabolism and immune response, 2021

Expert note from Sport Zona

With our athletes, we notice that adding resistant starch to their diet significantly helps improve digestion without negatively affecting caloric balance. An easy option is to add slightly cooled potatoes or rice to meals. This is a convenient way to provide important fiber without relying entirely on raw fruits and vegetables, which can sometimes cause discomfort.

Frequently asked questions

How does resistant starch differ from regular carbohydrates?

Resistant starch is not broken down in the small intestine but reaches the large intestine, where it ferments. Unlike rapidly digestible carbohydrates, it does not cause a sharp increase in blood sugar.

What are the main benefits of resistant starch for athletes?

It aids in better glycemic control, providing sustained energy during workouts. Resistant starch also contributes to a greater feeling of fullness, supporting weight management.

Does resistant starch have side effects?

Generally, resistant starch is well-tolerated. However, if intake is increased too quickly, mild digestive discomforts like gas may occur.

When is the best time to consume resistant starch?

It can be consumed as part of main meals or before a workout to maintain energy levels. It is important to incorporate it evenly into the daily diet.