Nutrition Literacy Assessment Instrument
Also known as: NLAI, Nutrition Literacy Assessment, Nutrition Literacy
The NLAI is a 26-item validated instrument measuring nutrition literacy—the ability to understand nutrition information and use it to make healthy food choices. Developed by Diamond and refined through validation studies by Rothman and colleagues, the NLAI evaluates comprehension of nutrition labels, understanding of portion sizes, knowledge of daily values, and ability to interpret nutrient claims. Nutrition literacy is a critical determinant of dietary quality and health outcomes, particularly in populations with low general literacy or limited numeracy.
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When to use it
The NLAI is appropriate for assessing nutrition literacy in clinical, research, and public health settings. Use in nutrition intervention trials to measure baseline literacy and post-intervention improvement. Suitable for screening individuals in health centers, community centers, and food assistance programs who may benefit from nutrition education. Helpful in evaluating the effectiveness of nutrition education programs, label reform campaigns, or front-of-package labeling initiatives. Recommended for research examining relationships between nutrition literacy and dietary quality, obesity, or chronic disease risk.
Strengths & limitations
- Validated instrument with demonstrated reliability and discriminant validity across diverse populations.
- Practical, functional assessment of skills needed for food label use and dietary decision-making.
- Identifies specific knowledge gaps (labels vs. portion sizes vs. nutrient claims) enabling targeted education.
- Responsive to nutrition education interventions; measurable improvement documented after counseling.
- Feasible for large surveys and clinical screening; self-administered format reduces administrator burden.
- Associated with dietary outcomes; nutrition literacy predicts dietary quality and weight status.
- Knowledge does not equal behavior; high nutrition literacy does not guarantee healthy eating if food access/affordability is limited.
- Does not assess numeracy skills required for portion/portion size calculation; person may know label components but struggle with math.
- Label-centric; focuses on packaged food label reading; less applicable to whole foods, restaurant meals, or traditional/cultural foods.
- Snapshot of knowledge; does not capture how often respondent actually uses nutrition information when shopping or eating.
- Does not assess understanding of health claims on food marketing or ability to evaluate nutrition information from media/internet sources.
- Language and literacy-dependent; respondents with low general literacy may score low due to reading difficulty, not nutrition knowledge.
Frequently asked
Is nutrition literacy the same as general health literacy, and should I assess both?
No. General health literacy is the ability to understand health information broadly (medical terms, appointment-keeping, medication instructions). Nutrition literacy is specific to food and diet information. A person with good general health literacy may struggle with nutrition labels due to limited numeracy (understanding percentages, serving sizes). Assess both if health outcomes (e.g., diabetes management) require both; for diet-specific interventions, NLAI alone is sufficient. If numeracy is a barrier, consider the Newest Vital Sign (NVS), which includes a nutrition label reading task.
How do I administer the NLAI to someone with very low literacy or language barriers?
The standard NLAI is self-administered and assumes ~8th-grade reading level. For low-literacy individuals, use interviewer-administered version with simplified language and visual aids (photos of labels, food models for portion sizes). For non-English speakers, use validated translations if available; otherwise, have trained bilingual staff adapt and administer. Note that very low literacy may make NLAI administration infeasible; in these cases, focus nutrition education on behavior and verbal instruction rather than label reading.
Can NLAI scores be compared across countries or cultural contexts?
The original NLAI is U.S.-specific, reflecting U.S. nutrition label format and packaged foods. For international or multicultural use, adapt and revalidate the NLAI for local label formats, food systems, and nutrition priorities. A person in a country without nutrition labeling or in a culture relying on whole foods may score low on NLAI not due to poor nutrition knowledge but due to different food systems. Always contextualize NLAI within local food environment.
What is the difference between nutrition literacy and nutrition knowledge?
Nutrition knowledge is factual information (iron is in red meat, fiber helps digestion). Nutrition literacy is the ability to find, understand, and apply that information (reading a label to find iron content, choosing high-fiber foods based on label info). The NLAI measures literacy (applied knowledge), not just knowledge. Someone may 'know' that fiber is healthy but lack the literacy to identify high-fiber foods in the store. Education should address both knowledge and literacy.
Sources
- Diamond, M. R. (2007). Development of a reliable and valid nutrition literacy assessment instrument. Journal of Nutrition Education and Behavior, 39(Suppl 5), S26–S30. link ↗
- Rothman, R. L., Housam, R., Weiss, H., et al. (2006). Patient understanding of food labels: the role of literacy and numeracy. American Journal of Preventive Medicine, 31(5), 391–398. DOI: 10.1016/j.amepre.2006.07.025 ↗
How to cite this page
ScholarGate. (2026, June 3). Nutrition Literacy Assessment Instrument. ScholarGate. https://scholargate.app/en/public-health-nutrition/nutrition-literacy-scale
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
- HDDSPublic Health Nutrition↔ compare
- HEI-2020Public Health Nutrition↔ compare
- MDQIPublic Health Nutrition↔ compare