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Refined carbs are grains and sugars that have been processed so that much of their fiber is gone, such as white bread, white rice, regular pasta, crackers, pastries and sugary drinks. The Dietary Guidelines for Americans 2025-2030 tell Americans to prioritize fiber-rich whole grains and significantly reduce highly processed refined carbohydrates. Below we explain simple carbs vs complex carbohydrates, show USDA data comparing refined and whole-grain foods side by side, and clear up a few common myths, including why enriched white bread can carry more folate than whole wheat.
Peptide Labs does not sell bread, grains or other carbohydrate foods. This article is general nutrition information, not medical advice.
Key Takeaways
- Refined carbs are processed grains and added sugars with most of the fiber removed.
- MedlinePlus calls sugars simple carbohydrates and starches complex carbohydrates.
- In USDA data, whole-grain versions usually carry two to five times more fiber than refined ones.
- Enriched refined grains have some B vitamins and iron added back, so they can match or beat whole grains on folate.
- The Dietary Guidelines say to limit refined grains and make at least half of grains whole.
What are refined carbs?
There is no single legal definition of refined carbs, but the term usually covers two groups. The first is refined grains. The Dietary Guidelines 2020-2025 list examples such as white breads, refined-grain cereals and crackers, corn grits, cream of rice, cream of wheat, pearled barley, masa, pasta and white rice. The second is added sugars, which show up in candy, cookies, cakes, pastries and regular soda. The 2025-2030 guidelines name white bread, ready-to-eat or packaged breakfast options, flour tortillas and crackers as examples of highly processed refined carbohydrates to cut back on.
MedlinePlus notes that refined grains such as pastries, white bread, crackers and white rice still contain starch, but they lack B vitamins and other nutrients unless they are marked enriched. That is why the Dietary Guidelines add that refined-grain choices should be enriched.
Simple carbs vs complex carbohydrates
Simple carbs are sugars. MedlinePlus explains that they occur naturally in nutrient-rich foods such as fruits and milk, and are added to foods like candy, baked goods and regular soda. Complex carbohydrates are starches. MedlinePlus lists dried and canned beans, such as kidney, black and pinto beans, split peas and garbanzo beans, and whole grains such as brown rice, oats, barley and quinoa.
| Type | What it is | Examples (MedlinePlus, Dietary Guidelines) | Usually comes with |
|---|---|---|---|
| Simple carbs, natural | Sugars in whole foods | Fruit, milk, yogurt | Fiber in fruit; protein and calcium in dairy |
| Simple carbs, added | Sugars added in processing | Candy, cookies, pastries, regular soda | Few other nutrients |
| Complex, whole | Starch plus fiber | Beans, lentils, oats, barley, quinoa, whole wheat | Fiber, protein, minerals |
| Complex, refined | Starch with most fiber removed | White bread, white rice, regular pasta, crackers | Added B vitamins and iron if enriched |
The simple vs complex carbs split is useful but incomplete. Fruit is mostly simple carbohydrate yet comes packaged with fiber and water, while white bread is complex carbohydrate yet has little fiber. Whether a food is whole or refined often tells you more than whether its carbohydrate is simple or complex. For how different carbohydrate foods affect blood sugar, see our glycemic index guide.
Refined carbs vs whole grains: the USDA numbers
The table compares common refined foods with whole-grain counterparts using USDA FoodData Central SR Legacy entries. Percent Daily Value (%DV) uses FDA label values. Portions are the standard USDA serving for each food, so calories and carbohydrate are not always matched.
| Food (FDC ID) | Serving | Calories | Carbs | Fiber (%DV) | Folate %DV | Magnesium %DV |
|---|---|---|---|---|---|---|
| White bread (174924) | 1 slice (29 g) | 77 | 14.3 g | 0.8 g (3%) | 12% | 2% |
| Whole-wheat bread (172688) | 1 slice (32 g) | 81 | 13.7 g | 1.9 g (7%) | 3% | 6% |
| Pasta, enriched, cooked (169737) | 1 cup (124 g) | 196 | 38.3 g | 2.2 g (8%) | 37% | 5% |
| Whole-wheat pasta, cooked (168910) | 1 cup (117 g) | 174 | 35.2 g | 4.6 g (16%) | 6% | 15% |
| White rice, enriched, cooked (168878) | 1 cup (158 g) | 205 | 44.5 g | 0.6 g (2%) | 38% | 5% |
| Brown rice, cooked (169704) | 1 cup (202 g) | 249 | 51.7 g | 3.2 g (12%) | 5% | 19% |
| Oats, cooked with water (173905) | 1 cup (234 g) | 166 | 28.1 g | 4.0 g (14%) | 4% | 15% |
| Cola, regular (174852) | 12 fl oz (370 g) | 155 | 38.3 g | 0 g (0%) | 0% | 0% |
Three patterns stand out. Whole-grain versions carry more fiber and more magnesium in every pair. Calories and total carbohydrate are similar within each pair, so swapping refined for whole grains is mainly about what comes along with the carbohydrate, not cutting it. And the enriched refined foods carry much more folate, because folic acid is added during enrichment. That is why the Dietary Guidelines say people who eat only whole grains should include some that are fortified with folic acid. A can of regular cola, by contrast, supplies about the same carbohydrate as a cup of pasta, almost all of it sugar, with no fiber.
Our guides to oats, quinoa and sweet potatoes profile individual complex carbohydrate foods, and our list of fiber-rich foods covers many more. For how much fiber adults are advised to get, see our daily fiber guide.
What the Dietary Guidelines say
Both recent editions of the Dietary Guidelines point in the same direction. The 2020-2025 edition says healthy dietary patterns include whole grains and limit refined grains, that at least half of total grains should be whole grains, and that refined-grain choices should be enriched. It also notes that grains are often eaten in forms with more sodium, such as breads, tortillas and crackers, and more added sugars, such as grain-based desserts and many ready-to-eat breakfast cereals. The 2025-2030 edition is blunter: prioritize fiber-rich whole grains and significantly reduce highly processed refined carbohydrates. Neither edition says to avoid carbohydrates altogether.
How to spot refined carbohydrates on a label
- Read the ingredient list. Look for the word whole, as in whole wheat flour or whole oats. Enriched wheat flour is refined flour with some nutrients added back.
- Do not judge by color alone. A darker bread is not automatically whole grain, so check the ingredients rather than the look of the loaf.
- Check fiber and added sugars. The Nutrition Facts label lists both, which makes it easy to compare two breads or cereals.
- Watch the extras. Many refined carb foods, like pastries, crackers and sweetened cereals, also bring added sugars, sodium or fat.
Common myths about refined carbs and simple carbs
- All carbs are bad. The Dietary Guidelines recommend whole grains, beans, fruit and dairy, all of which supply carbohydrate. For lower-carbohydrate food options, see our guide on that topic.
- Fruit sugar is the same as soda sugar. Both are simple carbs, but MedlinePlus notes that sugar in fruit and milk comes with other nutrients, while added sugar in soda does not.
- Whole grain always beats enriched. On fiber and magnesium, yes in the USDA data above. On folate, enriched products often come out ahead.
- Refined carbs cause cravings in everyone. Responses vary from person to person; our cravings guide covers what research has looked at.
A Mediterranean-style pattern built around whole grains, beans and vegetables is one well-studied way to eat fewer refined carbs; see our Mediterranean diet guide. Beans and whole grains are also the main sources of lectins, which our lectins guide explains. If you manage blood sugar or another health condition, talk to your clinician or a registered dietitian about which carbohydrate foods suit you.
Frequently Asked Questions
What are refined carbs?
Refined carbs are grains and sugars processed so that most of the fiber is removed, such as white bread, white rice, regular pasta, crackers, pastries and sugary drinks.
What is the difference between simple and complex carbs?
MedlinePlus defines simple carbs as sugars, found in fruit, milk and sweets, and complex carbohydrates as starches, found in beans, whole grains and refined grains.
Are complex carbohydrates always healthy?
Not always. White bread and white rice are complex carbohydrates but are refined and low in fiber. Whole grains and beans keep more fiber and minerals.
Is white rice a refined carb?
Yes. The Dietary Guidelines list white rice among refined grains. Enriched white rice has some B vitamins and iron added back but little fiber.
Are simple carbs bad for you?
It depends on the source. Natural sugars in fruit and milk come with other nutrients, while added sugars in candy and soda bring calories with few nutrients.
Is whole-wheat bread better than white bread?
In USDA data a slice of whole-wheat bread has more than twice the fiber and three times the magnesium of white bread, while enriched white bread has more folate.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Brown Rice: USDA Nutrition, Brown vs White Rice and Arsenic Facts, Low Glycemic Foods: Glycemic Index Chart and Glycemic Load Explained, High Fiber Foods: USDA List of Fruits, Vegetables, Beans and Grains.