According to Gram Research analysis, children in single-mother households in Japan were 13.4% more likely to have poor diet quality during the COVID-19 pandemic compared to two-parent households. However, this gap was largely explained by lower family income and reduced food preparation knowledge rather than single motherhood itself, suggesting that targeted financial and educational support could significantly improve outcomes.
A new study from Japan looked at how family structure affects what kids eat. Researchers surveyed over 1,500 families during the COVID-19 pandemic to see if children in single-mother households ate differently than those with two parents. They found that kids in single-mother homes were more likely to miss important food groups like dairy, meat, vegetables, and fruits. The good news? When researchers accounted for family income and cooking knowledge, the gap got much smaller. This suggests that money and food skills—not single motherhood itself—are the real challenges.
Key Statistics
A 2026 cross-sectional study of 1,534 Japanese families found that children in single-mother households were 13.4% more likely to have poor dietary quality during the COVID-19 state of emergency compared to two-parent households.
When researchers accounted for family income and parents’ food knowledge in their analysis, the 13.4% dietary quality gap between single-mother and two-parent households substantially diminished, suggesting these factors—not family structure—drive the difference.
Single-father households in the study did not show significantly higher rates of poor dietary quality compared to two-parent households, indicating that single mothers face unique challenges distinct from single parenthood alone.
The Quick Take
- What they studied: Whether children in single-mother households eat less healthy diets than children in two-parent households, and what factors explain any differences
- Who participated: 1,534 parents in Japan with children in 5th and 8th grade, surveyed in December 2020 during the COVID-19 pandemic
- Key finding: Children in single-mother households were 13.4% more likely to have poor diet quality during the pandemic and 8.3% more likely after it ended, compared to two-parent households. However, this gap shrank significantly when researchers accounted for family income and parents’ cooking knowledge
- What it means for you: If you’re a single mom worried about your kids’ nutrition, the issue isn’t your family structure—it’s likely about resources and cooking skills. Programs that teach meal planning and provide food assistance could make a real difference
The Research Details
Researchers used a nationwide survey in Japan that asked parents about their children’s eating habits at three different times: before the COVID-19 state of emergency (before April 2020), during it, and after it ended. They surveyed families with children in 5th and 8th grade, selecting households randomly to represent the whole country. Parents reported what their kids ate and answered questions about their own knowledge of nutrition and food preparation.
The researchers defined ‘poor diet quality’ as a child not eating at least two servings per day from four important food groups: milk and dairy products, meat/fish/eggs, vegetables, and fruits. They then compared single-mother households to two-parent households, looking at whether family income and parents’ food knowledge explained any differences they found.
This research design is important because it captures a real moment in time (during a major crisis) and looks at actual family situations rather than controlled lab conditions. By measuring both family structure and other factors like income and cooking skills, the researchers could figure out what actually causes the dietary differences—not just that they exist
This study surveyed a large, nationally representative sample of Japanese families, which is a strength. However, parents reported their children’s eating habits from memory, which can be less accurate than direct measurement. The study was conducted at one point in time, so it shows associations but not cause-and-effect. The findings may be most relevant to Japan’s context and may differ in other countries with different social support systems
What the Results Show
Single-mother households showed significantly higher rates of poor dietary quality compared to two-parent households. During the pandemic state of emergency, children in single-mother homes were 13.4% more likely to have inadequate intake from the four key food groups. After the emergency ended, this gap remained at 8.3%.
However, when researchers adjusted their analysis to account for family income and parents’ food literacy (knowledge about nutrition and cooking), the difference between single-mother and two-parent households became much smaller. This is the crucial finding: the dietary gap wasn’t primarily about being a single mother—it was about having less money and less cooking knowledge.
Interestingly, single-father households did not show the same pattern of poor dietary quality. This suggests that single mothers face unique challenges, possibly related to time constraints, financial pressures, or other factors specific to their situation.
The study found that food literacy (parents’ knowledge about nutrition and meal preparation) and financial status were the key factors explaining dietary differences. Single-mother households tended to have lower incomes and less food knowledge, which directly contributed to poorer diet quality in their children. This points to modifiable factors—things that can be changed through intervention—rather than unchangeable family structure
This research adds important nuance to existing studies on family structure and child nutrition. While previous research has shown that single-parent households sometimes have worse health outcomes, this study demonstrates that the real culprits are economic resources and cooking skills, not the family structure itself. This aligns with broader research showing that poverty and lack of education are stronger predictors of poor nutrition than family composition
Parents reported their children’s eating habits from memory, which may not be perfectly accurate. The study was conducted at one specific time (December 2020), so we can’t know if these patterns continued long-term. The research was done in Japan, where social systems and food availability differ from other countries, so results may not apply everywhere. The study shows associations but cannot prove that low income or poor food knowledge directly cause poor diet quality—only that they’re connected
The Bottom Line
Single mothers should prioritize accessing resources that address the two key factors identified in this research: (1) Financial assistance programs like food stamps or community food banks, and (2) Nutrition education and cooking classes. Schools, community centers, and nonprofits often offer free or low-cost cooking classes and nutrition counseling. High confidence: These interventions address the actual barriers identified in the research
Single mothers with school-age children should pay attention to this research, as should policymakers, school administrators, and community health workers. Two-parent households may find the research useful for understanding challenges others face. Single fathers may not need to prioritize this as urgently based on this study’s findings
Improvements in diet quality can happen relatively quickly—within weeks to a few months—once families have better access to resources and cooking knowledge. However, building sustainable eating habits typically takes 2-3 months of consistent practice
Frequently Asked Questions
Do single moms have a harder time feeding their kids healthy food?
Research shows single-mother households do face higher rates of poor diet quality in children, but not because of single motherhood itself. The real barriers are lower income and less cooking knowledge. When these factors are addressed, the gap shrinks significantly.
What food groups are kids in single-mother homes missing most?
The study defined poor diet quality as missing at least two daily servings from any of these groups: milk and dairy, meat/fish/eggs, vegetables, or fruits. The research didn’t specify which groups were missed most often.
How can single mothers improve their kids’ nutrition on a tight budget?
Focus on the four key food groups and look for free resources: food banks, SNAP benefits, community cooking classes, and budget meal-planning apps. Building cooking skills and accessing financial assistance are the two most impactful changes based on this research.
Did the pandemic make things worse for single moms feeding their families?
Yes, the study found poor diet quality was 13.4% higher in single-mother households during the pandemic emergency. After the emergency ended, the gap decreased to 8.3%, suggesting pandemic-specific stressors temporarily worsened the situation.
Are single fathers having the same food challenges as single mothers?
No, the study found single-father households did not show significantly higher rates of poor diet quality compared to two-parent households, suggesting single mothers face unique barriers beyond single parenthood.
Want to Apply This Research?
- Track daily servings from the four key food groups (dairy, protein, vegetables, fruits) for each child. Set a goal of at least 2 servings per group per day and log what was actually consumed
- Use the app to find free or low-cost cooking classes in your area, access meal planning templates that work with a tight budget, and get reminders to include all four food groups in daily meals
- Weekly check-ins to review whether the four food groups were represented most days. Monthly reviews to identify which groups are most often missed and adjust meal planning accordingly
This research describes associations found in a specific population (Japanese families during COVID-19) and should not be interpreted as medical advice. Individual circumstances vary widely. Parents concerned about their child’s nutrition should consult with a pediatrician or registered dietitian. This study shows correlations, not definitive cause-and-effect relationships. Results may not apply to all countries or family situations due to differences in social support systems, food availability, and cultural factors.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.