The Difference Between Digestible and Indigestible Carbs
Carbohydrates are a macronutrient categorized based on their chemical structure and how the body processes them. The key to understanding digestibility lies in distinguishing between those the body can break down and those it cannot.
- Digestible Carbohydrates: These include simple sugars (glucose, fructose, sucrose) and starches (complex carbs). The body's digestive enzymes break these down into single sugar units (monosaccharides), primarily glucose, which are then absorbed into the bloodstream for energy.
- Indigestible Carbohydrates: Known as dietary fiber, these are parts of plant foods that the human body cannot fully digest or absorb. Instead of being broken down for energy in the small intestine, fiber passes largely intact to the large intestine, where it provides food for beneficial gut bacteria. While crucial for bowel health, fiber can cause bloating and gas for those with sensitive stomachs.
Reading Nutrition Labels to Find Digestible Carbohydrates
To determine the amount of digestible carbohydrate in a packaged food, you need to perform a simple calculation using the information provided on the nutrition label. This result is often referred to as "net carbs".
- Find Total Carbohydrates: Look for the "Total Carbohydrate" number, which includes sugars, starches, and fiber.
- Find Dietary Fiber: Locate the "Dietary Fiber" entry under the total carbohydrates.
- Calculate Net Carbs: Subtract the grams of Dietary Fiber from the grams of Total Carbohydrates. The result is the amount of carbohydrate that your body will digest for energy.
For example, if a slice of bread has 16 grams of Total Carbohydrates and 2 grams of Dietary Fiber, it contains 14 grams of digestible carbs. For foods with sugar alcohols, some or all of their carb content can also be subtracted, but this requires more advanced knowledge.
Digestible Carbohydrate Choices: A Comparison
To help you make informed decisions, here is a comparison of different types of digestible carbs based on their speed of digestion and typical use cases.
| Food Type | Example Foods | Digestion Speed | Best For | Considerations | |
|---|---|---|---|---|---|
| Fast-Digesting Carbs | White rice, white bread, ripe bananas, sports drinks, cooked carrots | Rapid | Quick energy boost, post-workout recovery, sensitive digestion | Can cause blood sugar spikes; lack fiber and other nutrients | |
| Slow-Digesting Carbs | Whole grains, lentils, beans, starchy vegetables | Gradual | Sustained energy, promoting fullness, managing blood sugar | High in fiber, potentially unsuitable for sensitive stomachs | |
| Moderately-Digesting | Oatmeal, applesauce, sweet potatoes, cooked peas | Moderate | Balanced energy, pre-workout fuel, general nutrition | Good source of vitamins/minerals with moderate fiber | 
How Cooking and Preparation Affects Digestibility
The way you prepare food can have a significant impact on how easily your body can digest the carbohydrates it contains. Cooking, cooling, and processing all play a role.
- Cooking Starchy Foods: Cooking, especially boiling or mashing, breaks down the plant cell walls and gelatinizes starches, making them easier for enzymes to access and digest. For example, a baked potato is more digestible than a raw one.
- Cooling Cooked Starches: When starchy foods like rice or potatoes are cooked and then cooled, some of the starch molecules recrystallize into a form called resistant starch (RS3). This type of starch resists digestion, acting more like fiber and benefiting gut health but potentially causing discomfort for sensitive individuals.
- Processing: Refined grains, such as white bread or white rice, have had their fibrous outer layers removed during processing, resulting in a product that is digested very quickly. Whole grains, in contrast, retain this fiber, slowing down digestion.
Finding Digestible Carbs for Specific Needs
Your individual needs, from athletic performance to managing a sensitive stomach, dictate the best types of digestible carbohydrates for you.
For Athletic Performance
Athletes often need both fast- and slow-digesting carbs at different times.
- Before/During a workout: Fast-digesting carbs provide immediate energy. Examples include sports drinks, white bread, or a banana.
- Long-lasting fuel: For sustained energy, choose slow-digesting options like oatmeal or sweet potatoes a few hours before exercise.
- Post-workout recovery: Fast-digesting carbs are important for quickly replenishing muscle glycogen stores. Chocolate milk or white rice with protein are common choices.
For Sensitive Stomachs and Low FODMAP Diets
If you experience digestive issues like bloating or gas, focusing on low-fiber and low FODMAP (Fermentable Oligo-, Di-, Mono-saccharides And Polyols) carbohydrates can help.
- Low-Fiber Fruits: Ripe bananas, applesauce, and cooked pears are gentle on the stomach.
- Well-Cooked Vegetables: Cooked carrots, pumpkin, and green beans are easier to digest than their raw counterparts due to the breakdown of cellulose.
- Low FODMAP Grains: Plain white rice is generally well-tolerated.
List of Easily Digestible Foods
- Fruits: Ripe bananas, applesauce, cooked pears, cantaloupe.
- Vegetables: Cooked carrots, sweet potatoes, pumpkin, spinach.
- Grains: Plain white rice, cream of wheat, white pasta.
- Dairy: Yogurt and kefir contain probiotics, which aid digestion.
- Protein Sources (for balance): Eggs, lean chicken, and fish are good complements.
Conclusion
Navigating the world of carbohydrates doesn't have to be complicated. By understanding the distinction between digestible and indigestible forms, and by using tools like nutrition labels, you can make smarter food choices tailored to your body's specific needs. For quick energy, prioritize fast-digesting carbs like white rice and ripe bananas. For sustained energy and improved digestive comfort, especially with a sensitive stomach, opt for low-fiber, low-FODMAP options and properly cooked starchy foods. Balancing these various carbohydrate types is crucial for optimizing energy levels and supporting overall digestive wellness.
External Resources
For further reading on carbohydrate digestion and overall nutrition, visit the American Heart Association's guide: Carbohydrates | American Heart Association