IDDSI Level 1
Slightly Thick
Thicker than water, still drinkable through a straw.
What it is
Flows a little slower than water. Often used for infants, but some adults are prescribed it.
What it looks like
Similar to many anti-regurgitation infant formulas or naturally thick nectars.
The official test
10 mL syringe flow test: 1–4 mL remains after 10 seconds.
Run the guided syringe testFoods that typically fit
- Commercially pre-thickened waters labeled Level 1
- Some buttermilks
- Some nutrition shakes
Products can vary by batch. Always verify with the IDDSI tests before serving.How to test →
Common mistakes
- Eyeballing it, Level 1 is hard to judge visually. Always confirm with the syringe test.
- Letting thickened drinks sit, many keep thickening over time.