Carbohydrates
Also known as Carbs, Total carbohydrate
Carbohydrates are the body's primary and preferred energy source, and the only fuel the brain and red blood cells use efficiently. The RDA is 130 g/day for adults and children, set to cover the brain's glucose needs, while the acceptable range is 45 to 65 percent of daily calories. Quality matters: whole grains, fruits, vegetables, and legumes are preferred over refined starches and added sugars.
Why it matters
What it does in your body
- Provides the body's main energy source
- Fuels the brain and red blood cells with glucose
- Spares protein from being burned for energy
- Supplies dietary fiber and plant compounds
- Supports gut health through fiber and resistant starch
By age, sex, and life stage
How much you need
The carbohydrate RDA is 130 g/day for adults and children, based on the average minimum glucose the brain uses. The acceptable range is 45 to 65 percent of daily calories. Needs rise in pregnancy (175 g/day) and lactation (210 g/day).
Recommended intake across life
in grams/dayBars scale to the highest recommendation shown. Where men and women differ, both values are listed.
Full reference table
| Life stage | Male | Female |
|---|---|---|
| Children 1-18 | 130 | 130 |
| Adults 19+ | 130 | 130 |
| Pregnancy | n/a | 175 |
| Lactation | n/a | 210 |
Values in grams/day. AI marks an Adequate Intake, used when there is not enough evidence for a formal recommendation.
What moves the number
What changes your needs
Activity level
Endurance athletes and highly active people need more carbohydrate to refuel glycogen stores.
Total calorie needs
Because the target is a percent of calories, gram amounts rise with a larger overall diet.
Pregnancy and lactation
Needs rise to 175 g/day in pregnancy and 210 g/day during lactation.
Blood sugar management
People managing diabetes may adjust carbohydrate amount and type with medical guidance.
Running low
Signs you might not get enough
Most at risk: Uncommon on typical diets. Seen with very low-carbohydrate or ketogenic diets, prolonged fasting, or severe food restriction.
Too much
Can you get too much?
Excess comes mainly from refined grains and added sugars rather than total carbohydrate. Emphasize whole, fiber-rich sources and keep added sugars under 10 percent of calories.
Where to get it
Best food sources
The bottom line
Get most of your carbohydrates from whole grains, fruits, vegetables, and legumes, aiming for 45 to 65 percent of calories, and keep refined starches and added sugars low.
Track carbohydrates automatically
Carbohydrates is one of the 92 nutrients Vora reads from a photo of your meal, so you can see where you stand without weighing or logging by hand.
Sources and method
The recommended intakes, upper limits, and food-source amounts on this page come from the primary references below. Numbers were checked against the current NIH Office of Dietary Supplements fact sheets and the Institute of Medicine (now the National Academies) Dietary Reference Intakes.
- Institute of Medicine, Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids (2005)
- Dietary Guidelines for Americans, 2020-2025
This page is for general education, not medical advice. Reference intakes are population averages for healthy people and do not replace guidance from your doctor or a registered dietitian, especially if you are pregnant, managing a health condition, or considering supplements.