According to Gram Research analysis of national health data from over 10,000 American adults, three specific habits are most strongly connected to eating a healthier diet: reading nutrition labels, eating restaurant food less often, and believing you eat well. People who reported excellent diet quality had significantly higher diet quality scores than those who perceived their diet as fair or poor. While these associations don’t prove cause-and-effect, they suggest that focusing on these changeable behaviors may be more effective for improving diet than targeting unchangeable personal characteristics.
A Gram Research analysis of data from over 10,000 American adults reveals what actually influences whether people eat well. Researchers found that three main things matter most: reading nutrition labels, how often you eat restaurant food, and whether you think your diet is healthy. Surprisingly, personal factors like age and income mattered less than these everyday choices. The study suggests that helping people improve their diet might work better if we focus on these specific habits rather than trying to change everything at once.
Key Statistics
A 2026 cross-sectional analysis of 10,000+ U.S. adults from the National Health and Nutrition Examination Survey found that people reading nutrition labels had significantly better overall diet quality scores compared to non-label readers.
According to research reviewed by Gram analyzing 2017-2020 national health data, adults who reported excellent or very good perceived diet quality scored approximately 5 points higher on the Healthy Eating Index-2020 compared to those with fair or poor perceived diet quality.
A 2026 study of American adults found that eating restaurant food less frequently was one of the three strongest modifiable factors associated with improved diet quality, alongside nutrition label use and positive diet perception.
Research from the National Health and Nutrition Examination Survey (2017-March 2020) showed that nutrition label reading and home meal frequency explained approximately 23% of the variation in diet quality scores among U.S. adults.
The Quick Take
- What they studied: What habits and personal factors influence whether adults eat a healthy diet, using a national health survey of Americans
- Who participated: Over 10,000 U.S. adults from the National Health and Nutrition Examination Survey between 2017 and early 2020, representing different ages, races, education levels, and body types
- Key finding: People who read nutrition labels, eat restaurant food less often, and believe they eat well have significantly better overall diet quality scores. Reading labels and limiting restaurant meals were among the strongest predictors of healthy eating.
- What it means for you: If you want to eat healthier, start with small, specific changes like checking nutrition labels and cooking more meals at home. Your belief that you can eat well also matters—confidence in your diet quality is connected to actually eating better. However, this study shows associations, not that these habits directly cause better health.
The Research Details
Researchers analyzed information collected from thousands of American adults between 2017 and March 2020 as part of a national health survey. They looked at two types of factors that influence food choices: things people can change (like reading labels or eating out) and things they can’t (like age or race). They used a scoring system called the Healthy Eating Index-2020 to measure how nutritious each person’s diet was, then used statistical methods to see which factors were most connected to better eating habits.
The study examined both personal characteristics (age, sex, race, body weight, education, relationship status) and daily habits (checking nutrition labels, how often eating restaurant food, familiarity with government nutrition guidelines, perceived diet quality, and work schedule). Researchers then used advanced statistical analysis to determine which factors had the strongest connection to overall diet quality.
This approach is important because it helps identify which specific behaviors and factors actually matter for healthy eating in real-world conditions. Rather than testing one change in a controlled lab, researchers looked at what naturally happens in people’s lives. This makes the findings more relevant to everyday people trying to improve their diets.
This study has several strengths: it used a large, nationally representative sample of Americans, meaning the findings likely apply broadly. However, because it’s a cross-sectional study (a snapshot in time), it shows associations between habits and diet quality but cannot prove that one causes the other. The study explains about 23% of the variation in diet quality, meaning other factors not measured here also play important roles. The research was published in a peer-reviewed nutrition journal, suggesting it met scientific standards.
What the Results Show
The research identified three modifiable habits most strongly connected to better diet quality: reading nutrition labels, eating restaurant food less frequently, and having a positive perception of your own diet quality. People who reported excellent or very good diet quality had Healthy Eating Index scores about 5 points higher than those who rated their diet as fair or poor—a meaningful difference.
When researchers looked at specific diet components, they found that label readers and those who eat out less often consumed more of the foods experts recommend (like vegetables and whole grains) and less of the foods to limit (like added sugars and sodium). Interestingly, familiarity with MyPlate (the government’s nutrition guide) was also connected to better diet quality, though the effect was smaller than label reading and restaurant frequency.
The study also examined how these factors affected two main aspects of diet quality: eating enough healthy foods and limiting unhealthy ones. Reading nutrition labels was particularly important for both aspects, while eating out less frequently had a stronger effect on limiting unhealthy foods.
Personal characteristics like age, sex, race, body weight, education level, and relationship status showed weaker connections to diet quality than the daily habits researchers measured. Work schedule and hours worked per week had minimal association with diet quality. This suggests that changing daily habits may be more effective than focusing on unchangeable personal characteristics.
This research aligns with previous studies showing that nutrition label use is connected to healthier eating patterns. The finding that restaurant food frequency matters confirms what other research has suggested about the challenges of eating well when eating out frequently. However, this study provides new evidence about how these factors work together in a large, representative U.S. population, and it highlights the importance of perceived diet quality—a factor that hasn’t received as much research attention.
The study shows associations between habits and diet quality but cannot prove these habits cause better eating. People who read labels might already be motivated to eat well, rather than the label reading itself causing the improvement. The study measured diet quality at one point in time, so we don’t know if these associations stay the same over months or years. Additionally, the study explains only about 23% of why people have different diet quality scores, meaning many other important factors weren’t measured. The research relied on people’s self-reported information, which can be less accurate than direct measurement.
The Bottom Line
If you want to improve your diet, focus on three specific, achievable changes: (1) Start reading nutrition labels when shopping to become aware of what you’re eating, (2) Cook more meals at home and eat restaurant food less often, and (3) Build confidence in your ability to eat well by setting small, realistic goals. These changes have strong evidence connecting them to better overall diet quality. Confidence level: Moderate—the study shows these factors are associated with better eating, but individual results may vary.
These findings apply to most American adults looking to improve their eating habits. They’re especially relevant for people who eat restaurant food frequently or rarely check nutrition labels. The recommendations are practical for people with various budgets and schedules, though eating out less may be easier for some than others. People with specific medical conditions should consult their healthcare provider before making major diet changes.
You might notice small changes in how you feel within 2-4 weeks of consistently reading labels and cooking at home more. Measurable improvements in diet quality (if tracked) could appear within 4-8 weeks. However, significant health benefits from improved diet quality typically take several months to become noticeable.
Frequently Asked Questions
What are the best ways to improve my diet quality?
Research shows three habits matter most: read nutrition labels when shopping, cook more meals at home instead of eating out, and build confidence in your ability to eat well. These factors are strongly connected to better overall diet quality in national studies of American adults.
Does reading nutrition labels actually help you eat healthier?
Yes, according to a 2026 analysis of 10,000+ Americans, reading nutrition labels was one of the three strongest factors associated with better diet quality. People who check labels tend to make healthier food choices overall.
How much does eating restaurant food affect diet quality?
Eating restaurant food frequently is significantly connected to lower diet quality scores. The study found that eating out less often was one of the top three modifiable factors linked to healthier eating patterns in American adults.
Can I improve my diet if I don’t have much time to cook?
While cooking at home more often is connected to better diet quality, even small increases help. Start by preparing one extra home-cooked meal per week and reading labels on packaged foods you buy. Small, consistent changes matter more than perfection.
Does my age or background affect whether I can eat healthier?
Research shows that changeable daily habits matter more than age, race, or education for diet quality. This means anyone can improve their eating regardless of personal characteristics by focusing on label reading, cooking at home, and building confidence in their diet choices.
Want to Apply This Research?
- Track three specific metrics weekly: (1) Number of times you read nutrition labels before purchasing food, (2) Number of meals eaten at home versus restaurants, and (3) Your perceived diet quality rating on a scale of 1-10. Monitor these weekly to see patterns and celebrate progress.
- Set a specific goal like ‘Read nutrition labels on 5 products this week’ or ‘Cook dinner at home 4 nights this week instead of eating out.’ Use the app to log each instance and receive encouragement. Start with one goal and add others once the first becomes routine.
- Create a weekly check-in where you review your label-reading frequency and home-cooking percentage. Set reminders to check labels while shopping. Use the app’s trend feature to visualize improvements over 4-8 weeks. Celebrate when you hit milestones like ‘read labels 10 times this week’ or ‘cooked at home 5 nights.’
This research shows associations between habits and diet quality but does not prove that changing these habits will directly cause health improvements. Individual results vary based on overall lifestyle, genetics, and medical conditions. Before making significant dietary changes, especially if you have diabetes, heart disease, or other medical conditions, consult with your healthcare provider or registered dietitian. This article is for informational purposes and should not replace professional medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.