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Carbohydrates: Dietary Sources and Requirements

Carbohydrates: Dietary Sources and Requirements

Carbohydrates are predominantly obtained from plant sources. With the exception of lactose found in milk and insignificant glycogen amounts in meat, most consumed carbohydrates have plant origins. Monosaccharides and disaccharides, or sugars, can be sourced from fruits, honey, milk, sugar cane, and sugar beets. Grains and vegetables are rich in the polysaccharide starch. Two types of polysaccharides provide fiber: cellulose, which is abundant in many vegetables, forms undigestible roughage or...

Carbohydrate Metabolism

Carbohydrate Metabolism

Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
Starch accounts for approximately 60% of the carbohydrates consumed by humans. Since amylase enzymes cannot function in the stomach's acidic environment, starch can only be digested in the mouth and small intestine. Simple sugars are found naturally in milk and fruits in the...

Carbohydrate Metabolism

Carbohydrate Metabolism

Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
Starch accounts for approximately 60% of the carbohydrates consumed by humans. Since amylase enzymes cannot function in the stomach's acidic environment, starch can only be digested in the mouth and small intestine. Simple sugars are found naturally in milk and fruits in the...

Introduction to Carbohydrates

Introduction to Carbohydrates

Carbohydrates, proteins, and fats are the primary macronutrients in the human diet. However, carbohydrates are the most favored source of energy in the body. They can be found in a wide variety of foods, including whole grains, fruit, and vegetables, in various forms, such as sugars, starch, and dietary fiber. Based on their structure, carbohydrates are classified into three main classes— monosaccharides, disaccharides, and polysaccharides. The body's cells can only utilize simple...

Carbohydrate Digestion

Carbohydrate Digestion

Carbohydrate digestion and metabolism break down simple and complex carbohydrates from food into saccharides (i.e., sugars) for the body to use as energy. Carbohydrate digestion starts in the mouth during mastication, or chewing. The masticated carbohydrates remain intact in the stomach. Digestion resumes in the duodenum of the small intestine, where pancreatic alpha-amylase and brush border enzymes of the microvilli convert complex carbohydrates to monosaccharides. Finally, the monosaccharides...

What are Carbohydrates?

What are Carbohydrates?

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Related Experiment Video

Updated: May 10, 2026

An Efficient Sample Preparation Method to Enhance Carbohydrate Ion Signals in Matrix-assisted Laser Desorption/Ionization Mass Spectrometry

An Efficient Sample Preparation Method to Enhance Carbohydrate Ion Signals in Matrix-assisted Laser Desorption/Ionization Mass Spectrometry

Published on: July 29, 2018

The new carbohydrate intake recommendations.

Asker Jeukendrup¹

¹School of Sport and Exercise Sciences, University of Birmingham, Birmingham, UK.

Nestle Nutrition Institute Workshop Series

|June 15, 2013

Summary

This summary is machine-generated.

New guidelines suggest higher carbohydrate intake during prolonged exercise, up to 105 g/h, using multiple transportable carbohydrates like glucose and fructose for improved endurance and performance. Recommendations now consider exercise intensity and duration.

Related Experiment Videos

Last Updated: May 10, 2026

An Efficient Sample Preparation Method to Enhance Carbohydrate Ion Signals in Matrix-assisted Laser Desorption/Ionization Mass Spectrometry

An Efficient Sample Preparation Method to Enhance Carbohydrate Ion Signals in Matrix-assisted Laser Desorption/Ionization Mass Spectrometry

Published on: July 29, 2018

Area of Science:

Sports Nutrition
Exercise Physiology
Human Performance

Background:

Previous recommendations for carbohydrate intake during prolonged exercise were 30-60 g/h.
These guidelines were general and did not account for exercise type, duration, intensity, or athlete level.
The upper limit was based on exogenous carbohydrate oxidation rates, and the lower limit was an estimated minimum for ergogenic effects.

Purpose of the Study:

To update recommendations for carbohydrate intake during exercise based on recent scientific advancements.
To investigate higher exogenous carbohydrate oxidation rates with multiple transportable carbohydrates.
To explore the effects of carbohydrate intake on performance during shorter, higher-intensity exercise.

Main Methods:

Review of studies on carbohydrate oxidation rates during exercise.
Analysis of the impact of ingesting multiple transportable carbohydrates (e.g., glucose:fructose).
Examination of carbohydrate's ergogenic effects during shorter, high-intensity exercise (1 hour at 80% VO2max).

Main Results:

Exogenous carbohydrate oxidation rates can exceed 105 g/h when using multiple transportable carbohydrates.
Carbohydrate ingestion during shorter, high-intensity exercise (1 hour, 80% VO2max) can enhance performance.
New recommendations are more individualized, considering exercise duration and intensity, and specifying carbohydrate type.

Conclusions:

Current understanding allows for more prescriptive and individualized carbohydrate intake recommendations during exercise.
Ingesting multiple transportable carbohydrates significantly increases oxidation rates.
Optimized carbohydrate intake strategies, considering type, duration, and intensity, are crucial for maximizing endurance capacity and performance.