Lettuce
What it is
Lettuce is a leafy vegetable eaten in salads and other dishes. Romaine lettuce is the named raw food used for this reference table.
What it does
For the named reference food, USDA lists 17 kcal, 3.29 g carbohydrate and 2.1 g fiber per 100 g edible portion. The table gives additional nutrients for that same food form. These figures describe composition, not an effect on a disease or a recommended serving.
Research context and ingredient forms
Reference food: Lettuce, cos or romaine, raw. These are historical SR Legacy data from the April 2018 release, published in FoodData Central in 2019. A different variety, preparation, water content, or commercial recipe can change the result. For a matching food, a portion estimate scales each value by edible portion grams divided by 100.
Using this information
Romaine is an example within the lettuce category, not a composition estimate for every lettuce variety. Dressings, cheese, and other salad additions need separate accounting.
Food sources and composition
| Nutrient | Amount and serving basis | Food and source |
|---|---|---|
| Energy | 17 kcal per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Protein | 1.23 g per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Total lipid (fat) | 0.3 g per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Carbohydrate, by difference | 3.29 g per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Fiber, total dietary | 2.1 g per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Calcium, Ca | 33 mg per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Iron, Fe | 0.97 mg per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Magnesium, Mg | 14 mg per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Potassium, K | 247 mg per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Vitamin C, total ascorbic acid | 4 mg per 100 g edible portion | Lettuce, cos or romaine, raw; Lettuce, cos or romaine, raw SR Legacy April 2018; FDC published 2019-04-01 |
Scientific Research & References
- Lettuce, cos or romaine, raw
2019 · USDA Agricultural Research Service
Limitations: Historical food/preparation-specific composition. Values can be analytical, calculated or imputed; not a current brand label or clinical-outcome estimate.
Source assessment recorded.
- USDA National Nutrient Database for Standard Reference, Legacy Release: Documentation
2018 · USDA Agricultural Research Service
Limitations: Historical dataset; values may be analytical, calculated, imputed, or assumed zero. Not clinical-outcome evidence.
Source assessment recorded.
Related dictionary entries
Products containing it
No label-specific product relationship has been reviewed for this entry.