What it does in the body
- Glycolipid synthesis (myelin, cell membranes)
- Glycoprotein synthesis (cell signaling and recognition)
- Converted to glucose for energy
- Lactose synthesis in mammary glands during lactation
- Cerebrosides and gangliosides formation in the brain
How much you need (Daily Value)
| Group | Recommended | Source |
|---|---|---|
| Adult male | No RDA; not essential. Typical intake 5-10g/day from dairy | N/A — endogenously synthesized |
| Adult female | No RDA; typical intake 5-10g/day | N/A |
| Pregnancy | No specific requirement; moderate dairy intake provides adequate galactose | N/A |
| Children | Obtained through breast milk/formula (lactose provides ~4g galactose per 100mL) | AAP |
| Older adults | No specific requirement | N/A |
Richest food sources
| Food | Amount | Where |
|---|---|---|
| Whole milk | 2.4g galactose per 100mL (from lactose) | global |
| Yogurt | 2.0g per 100g | global |
| Cheddar cheese | 0.1g per 100g (most lactose removed) | europe |
| Breast milk | 3.5g per 100mL | global |
| Butter | 0.1g per 100g | global |
| Chickpeas (cooked) | 0.3g per 100g (galactooligosaccharides) | middle-east |
| Beets | 0.1g per 100g | global |
If you don't get enough
Mild: No clinical deficiency — body can synthesize galactose from glucose via UDP-galactose epimerase
Moderate: Not applicable for dietary deficiency
Severe: Not applicable — galactose is not a dietary essential
Time to onset: Not applicable
Too much
Upper limit: No UL for healthy individuals; harmful at any level in classic galactosemia. Normal hepatic metabolism handles dietary loads well
In galactosemia: cataracts, liver failure, intellectual disability, ovarian failure. In healthy individuals: excessive galactose processed like glucose
How well you absorb it
Absorbed via SGLT1 in small intestine (same transporter as glucose); near 100% absorption in healthy gut
Helped by: Lactase enzyme activity (enables lactose → galactose + glucose), Normal liver function for Leloir pathway
Hindered by: Lactase deficiency (prevents lactose digestion, not galactose absorption per se), Galactosemia enzyme deficiency
Cooking & storage
Stable during normal cooking. Fermentation (yogurt, cheese) reduces lactose (and thus galactose) content. Hard aged cheeses have minimal galactose.
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