What it does in the body
- Primary energy substrate for brain and red blood cells
- Central molecule of cellular respiration (glycolysis → Krebs cycle)
- Glycogen storage precursor in liver and muscle
- Pentose phosphate pathway substrate (NADPH and nucleotide production)
- Substrate for glycoprotein and glycolipid synthesis
How much you need (Daily Value)
| Group | Recommended | Source |
|---|---|---|
| Adult male | 130g/day minimum for brain function; 45-65% of total calories from carbohydrates | IOM DRI |
| Adult female | 130g/day minimum; 45-65% of total calories | IOM DRI |
| Pregnancy | 175g/day minimum | IOM |
| Children | 130g/day minimum | IOM |
| Older adults | 130g/day minimum; adjust for insulin resistance | IOM/ADA |
Richest food sources
| Food | Amount | Where |
|---|---|---|
| Honey | 35g glucose per 100g | global |
| Dates (dried) | 33g glucose per 100g | middle-east |
| Grapes | 7.2g glucose per 100g | global |
| White rice (cooked) | 28g total carbs per 100g (digested to glucose) | east-asia |
| Banana | 5g glucose per 100g | global |
| Sweet potato (cooked) | 4.2g glucose per 100g | global |
| Mango | 2.0g glucose per 100g | south-asia |
| Corn/maize (cooked) | 3.4g glucose per 100g | mesoamerica |
If you don't get enough
Mild: Lightheadedness, irritability, difficulty concentrating, hunger
Moderate: Confusion, tremors, sweating, palpitations, visual disturbances
Severe: Seizures, loss of consciousness, coma, death (severe hypoglycemia <30 mg/dL)
Time to onset: Minutes to hours depending on baseline glycogen stores and metabolic rate
Too much
Upper limit: Chronic hyperglycemia (>140 mg/dL postprandial) causes glycation damage. No dietary UL but WHO recommends <10% total energy from free sugars (50g/day on 2000 kcal diet)
Short-term: osmotic diuresis, dehydration, diabetic ketoacidosis. Long-term: retinopathy, nephropathy, neuropathy, cardiovascular disease via AGE (advanced glycation end-product) formation
How well you absorb it
Near 100% absorption via SGLT1 and GLUT2 transporters in small intestine
Helped by: Insulin (promotes cellular uptake), Exercise (insulin-independent GLUT4 translocation), Chromium (enhances insulin signaling)
Hindered by: Fiber (slows absorption rate), Alpha-glucosidase inhibitors (acarbose), Fat and protein co-ingestion (slows gastric emptying)
Cooking & storage
Cooking starches (gelatinization) dramatically increases glucose availability — raw starch has low digestibility (~40%) while cooked starch approaches 90%. Cooling cooked starches creates resistant starch, reducing glucose impact.
Nutrisize Health totals every nutrient from what you actually eat, against targets set for your age and sex, and flags what's short — across 4,995 foods, on your device.
