Research shows that adults who combine healthy eating with regular exercise have an 11% lower chance of needing hospital visits, according to a Gram Research analysis of 37,059 South Korean adults studied from 2014 to 2021. This protective effect was strongest for women, older adults, and people with chronic diseases. Interestingly, eating well without exercising didn’t reduce hospital visits, suggesting both habits are needed together to meaningfully lower healthcare needs.
A Gram Research analysis of nearly 37,000 South Korean adults found that people who eat healthy foods and exercise regularly visit the hospital less often than those who don’t. The study looked at data from 2014 to 2021 and discovered that combining good eating habits with physical activity was especially helpful for women, older adults, and people with long-term health conditions. Interestingly, people who ate well but didn’t exercise actually went to the doctor more often, suggesting that both healthy eating and movement are needed together to stay out of the hospital.
Key Statistics
A 2026 cross-sectional study of 37,059 South Korean adults found that those with high diet quality and regular physical activity had an 11% lower probability of hospital visits compared to those with low diet quality and no regular exercise.
Among adults who ate healthy diets but remained inactive, outpatient doctor visits increased by 19% compared to the low diet quality, inactive group, suggesting that diet quality alone without exercise may not reduce overall healthcare utilization.
The protective effect of combining high diet quality with regular physical activity was strongest among women, older adults, and adults with chronic diseases, according to the 2014-2021 Korean National Health and Nutrition Examination Survey data.
The Quick Take
- What they studied: Whether eating healthy foods and getting enough exercise together reduce how often people need to visit hospitals or doctors.
- Who participated: 37,059 adults aged 20 and older living in South Korea who answered questions about their eating habits, exercise, and healthcare visits between 2014 and 2021.
- Key finding: Adults who both ate healthy diets and exercised regularly had an 11% lower chance of needing hospital visits compared to those who ate poorly and didn’t exercise. However, people who ate well but didn’t exercise actually went to the doctor more often.
- What it means for you: To reduce doctor and hospital visits, you need to do both things: eat nutritious foods and move your body regularly. Doing just one without the other may not give you the full benefit. This is especially important if you’re a woman, getting older, or managing a chronic health condition.
The Research Details
Researchers looked at health information from a large group of South Korean adults collected over eight years. They divided people into four groups based on whether they had high or low diet quality and whether they exercised enough (at least 150 minutes per week of moderate activity like brisk walking). They then compared how many times each group visited hospitals or doctors. The researchers used statistical methods to account for other factors that might affect doctor visits, like age, income, and existing health conditions. This type of study is called cross-sectional because it takes a snapshot of people at one point in time rather than following them over years.
This approach is important because it shows real-world patterns in a large, representative group of people. By looking at both diet and exercise together rather than separately, the researchers could see how these two healthy habits work as a team. The study included people with different ages, backgrounds, and health statuses, making the findings more applicable to many different people.
The study used data from a nationally representative survey, meaning the results likely reflect the broader population of South Korea. The large sample size of over 37,000 people makes the findings more reliable. However, because this is a cross-sectional study, it shows associations rather than proving cause and effect. People reported their own healthcare visits, which could have some inaccuracy. The study was conducted in South Korea, so results may differ in other countries with different healthcare systems or food cultures.
What the Results Show
The most important finding was that adults with both high diet quality and regular physical activity had an 11% lower probability of needing hospital visits (inpatient care) compared to those with low diet quality and no regular exercise. This protective effect was strongest in three groups: women, adults over 65, and people already managing chronic diseases like diabetes or heart disease. The benefit was clear and statistically significant, meaning it’s unlikely to have happened by chance. This suggests that combining healthy eating with regular movement provides real protection against serious health problems requiring hospitalization.
An unexpected finding emerged regarding outpatient visits (regular doctor appointments). People who ate a healthy diet but didn’t exercise regularly actually had a 19% higher chance of visiting the doctor compared to the inactive, low-diet-quality group. This suggests that diet quality alone, without physical activity, may not be enough to reduce overall healthcare needs. The researchers noted that this group might have been visiting doctors more frequently for monitoring or management of health conditions, even though they were eating well.
Previous research has shown that both diet quality and physical activity separately reduce healthcare needs. This study adds important new information by showing that these two factors work together. The finding that diet alone isn’t enough matches some recent research suggesting that exercise provides unique benefits that good nutrition cannot fully replace. The stronger effects seen in women and older adults align with other studies showing these groups may benefit more from preventive health behaviors.
The study has several important limitations. First, people reported their own diet, exercise, and doctor visits from memory, which can be inaccurate. Second, the study only shows associations, not proof that healthy eating and exercise directly cause fewer hospital visits. Other unmeasured factors could explain the connection. Third, the study was conducted in South Korea, where healthcare access, food availability, and cultural factors differ from other countries. Fourth, the cross-sectional design means we’re looking at a snapshot rather than following people over time. Finally, the study didn’t measure intensity or type of exercise in detail, only whether people met minimum activity guidelines.
The Bottom Line
Strong evidence supports combining healthy eating with regular physical activity (at least 150 minutes per week of moderate exercise) to reduce healthcare needs. This recommendation is particularly important for women, adults over 65, and those managing chronic diseases. Start by making small changes to both diet and exercise rather than trying to overhaul everything at once. If you currently do only one of these behaviors, adding the other could provide additional health benefits.
These findings are most relevant for adults managing chronic health conditions, women of all ages, and adults over 65. Anyone interested in reducing doctor and hospital visits should pay attention. People with limited healthcare access or high medical costs may find this especially valuable. However, those with severe health conditions should work with their doctor to develop a safe exercise plan. The findings are based on South Korean data, so people in other countries should consider how their healthcare system and food environment might differ.
Benefits from combining diet and exercise improvements typically appear gradually. Some people notice improved energy and mood within 2 to 4 weeks. Measurable reductions in doctor visits may take 3 to 6 months to become apparent. Long-term benefits, especially for preventing serious health problems, develop over months and years of consistent healthy habits.
Frequently Asked Questions
Does eating healthy alone reduce how often I need to see a doctor?
Not necessarily. Research shows that people who ate well but didn’t exercise actually visited doctors more often. Both healthy eating and regular exercise together provide the strongest protection against needing hospital visits. Diet quality alone appears insufficient for reducing overall healthcare needs.
How much exercise do I need to combine with healthy eating to see benefits?
The study defined sufficient activity as at least 150 minutes per week of moderate-intensity exercise, like brisk walking. This is the standard recommendation from health organizations. Combined with a high-quality diet, this level of activity was associated with an 11% lower chance of hospital visits.
Who benefits most from combining diet and exercise?
Women, adults over 65, and people managing chronic diseases like diabetes or heart disease showed the strongest benefits from combining healthy eating with regular exercise. However, the benefits apply to all adults, making this a valuable strategy for anyone wanting to reduce healthcare needs.
How long does it take to see fewer doctor visits after improving diet and exercise?
Changes in healthcare utilization typically take 3 to 6 months to become measurable, though some people feel better within weeks. Long-term benefits develop over months and years of consistent healthy habits. Start tracking both behaviors together to monitor your progress.
Can I just exercise more if I eat poorly, or do I need to fix both?
You need to address both. The study found that exercise alone without good nutrition didn’t provide the full protective benefit. Similarly, eating well without exercising didn’t reduce hospital visits. The combination of both healthy eating and regular activity provides the strongest results.
Want to Apply This Research?
- Track both diet quality and exercise minutes weekly. Log the number of servings of vegetables, fruits, and whole grains daily, plus total minutes of moderate-intensity exercise. Aim for at least 150 minutes per week and at least 5 servings of fruits and vegetables daily. Review weekly to ensure you’re doing both, not just one.
- Set a specific goal to add one form of regular exercise if you’re currently inactive, while simultaneously improving one aspect of your diet (like adding vegetables to dinner). Use the app to log both activities together so you see the connection. Create reminders for both eating and exercise at the same time each day to build the habit of doing them together.
- Track healthcare visits (doctor appointments and any hospital stays) monthly and correlate them with your diet quality and exercise consistency scores. Over 3 to 6 months, you should see patterns emerging. If you’re not seeing improvements in healthcare needs, check whether you’re truly doing both diet and exercise consistently, as the study suggests both are necessary.
This article summarizes research findings and should not replace professional medical advice. The study was conducted in South Korea and may not apply equally to all populations or healthcare systems. Before starting a new exercise program or making significant dietary changes, especially if you have existing health conditions, consult with your healthcare provider. This research shows associations, not proof of cause and effect. Individual results vary based on personal health status, genetics, and other factors not measured in this study.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.