According to Gram Research analysis, skipping meals is linked to excess weight in teenagers, but the pattern differs by gender. A 2026 cross-sectional study of 382 Brazilian students found that girls who skipped breakfast were 2.2 times more likely to be overweight, while boys who skipped dinner were 3.1 times more likely to have excess weight. Replacing meals with snacks showed no strong connection to weight problems, suggesting that eating regular meals may be important for healthy weight in teens.
A new study of 382 Brazilian teenagers found that skipping meals is connected to excess weight, but the pattern differs between boys and girls. Girls who skipped breakfast were more likely to be overweight, while boys who skipped lunch or dinner showed higher rates of excess weight. Interestingly, replacing meals with snacks did not show a strong connection to weight problems. The research suggests that eating regular meals, especially breakfast for girls and dinner for boys, may be important for maintaining a healthy weight during the teenage years.
Key Statistics
A 2026 cross-sectional study of 382 Brazilian adolescents found that girls who skipped breakfast had excess weight 50% of the time compared to 31.6% of girls who ate breakfast, making them 2.2 times more likely to be overweight.
In the same 2026 study of 382 Brazilian teenagers, boys who skipped dinner were 3.1 times more likely to have excess weight, with 15.5% of overweight boys skipping dinner compared to 5.5% of boys with normal weight.
A 2026 analysis of 382 Brazilian students found no significant association between replacing meals with snacks and excess weight, suggesting that the problem is specifically about skipping meals entirely rather than eating alternative foods.
The Quick Take
- What they studied: Whether skipping meals or replacing meals with snacks is connected to teenagers being overweight or having excess weight
- Who participated: 382 students from public schools in Rio de Janeiro, Brazil. The study looked at both boys and girls and collected information about their eating habits and body weight measurements
- Key finding: Girls who skipped breakfast were 2.2 times more likely to have excess weight, and boys who skipped dinner were 3.1 times more likely to have excess weight. Replacing meals with snacks did not show a strong connection to weight problems
- What it means for you: Eating regular meals, especially breakfast for girls and dinner for boys, may help teenagers maintain a healthy weight. However, this study shows a connection, not proof that skipping meals causes weight gain. Other factors like overall diet quality and physical activity also matter
The Research Details
Researchers collected information from 382 students at public schools in Rio de Janeiro, Brazil at one point in time. They asked students about their eating habits, including whether they skipped breakfast, lunch, or dinner, and whether they replaced meals with snacks. They also measured each student’s height and weight to calculate their Body Mass Index for Age, which is a way to determine if someone is overweight for their age.
The researchers used statistical tests to look for patterns. They compared how many overweight students skipped each meal versus how many students with normal weight skipped meals. They also used a mathematical method called logistic regression to figure out how much more likely a student was to be overweight if they skipped a particular meal.
This type of study is called cross-sectional because it takes a snapshot of information at one moment in time, rather than following students over months or years to see what happens.
This research approach is useful because it can quickly identify patterns in a large group of people. By studying 382 students at once, researchers could see whether meal skipping and weight problems tend to happen together. However, this type of study cannot prove that skipping meals causes weight gain, only that the two things are connected. Understanding these patterns helps researchers decide what topics need deeper investigation
The study’s strengths include a reasonable sample size of 382 students and the use of standardized measurements for weight and height. The research was conducted in a real-world setting with public school students. However, the study has limitations: it only looked at students in one city in Brazil, so results may not apply to teenagers in other places. The study collected information at only one point in time, so we cannot know if students who skip meals later gained weight, or if overweight students started skipping meals as a result of other factors. The study did not measure other important factors like how much physical activity students got or the overall quality of their diet
What the Results Show
The study found different patterns for boys and girls. Among girls, 50% of those who were overweight had skipped breakfast, compared to only 31.6% of girls with normal weight. This difference was statistically significant, meaning it was unlikely to happen by chance. The researchers calculated that girls who skipped breakfast were 2.2 times more likely to have excess weight.
For boys, the pattern was different. Boys with excess weight were more likely to skip lunch (13.8% versus 4.8% among boys with normal weight) and dinner (15.5% versus 5.5% among boys with normal weight). Boys who skipped dinner were 3.1 times more likely to have excess weight, which was the strongest association found in the study.
Interestingly, replacing meals with snacks did not show a strong connection to excess weight in either boys or girls. This suggests that the problem may be specifically about skipping meals entirely, rather than eating something different instead.
The study also examined lunch skipping in girls and breakfast skipping in boys, but these did not show strong associations with excess weight. This suggests that the timing of meal skipping may matter differently for different genders. The research did not find that replacing meals with snacks was associated with excess weight, which was somewhat surprising to researchers who expected snacking might contribute to weight problems
Previous research has shown that breakfast skipping is often linked to weight gain in teenagers, and this study supports that finding for girls. However, the stronger connection between dinner skipping and excess weight in boys is a newer finding that adds to our understanding. Most earlier studies did not look separately at boys and girls, so this gender difference is an important contribution. The finding that meal replacement with snacks was not associated with excess weight differs from some earlier research and suggests the issue is about eating nothing rather than eating different foods
This study has several important limitations. First, it only included students from public schools in Rio de Janeiro, so the results may not apply to teenagers in other cities or countries, or to students in private schools. Second, the study measured everything at one point in time, so we cannot tell whether skipping meals led to excess weight or whether overweight students started skipping meals for other reasons. Third, the study did not measure physical activity, which is a major factor in weight management. Fourth, the study did not look at the overall quality of students’ diets or how many calories they consumed. Finally, the study relied on students reporting their own eating habits, which may not always be accurate
The Bottom Line
Teenagers, especially girls, should try to eat breakfast regularly. Boys should make sure to eat dinner. These findings suggest that regular meal eating may support healthy weight management during the teenage years. However, this study shows only a connection, not definitive proof. A healthy weight also depends on overall diet quality, portion sizes, physical activity, and sleep. Teenagers concerned about their weight should talk to a doctor or nutritionist for personalized advice. Confidence level: Moderate. This is one study in one location, so more research is needed before making strong recommendations
Teenagers and their parents should pay attention to these findings, especially if the teenager is a girl who skips breakfast or a boy who skips dinner. School administrators and nutritionists may find this useful for planning school meal programs. Healthcare providers working with teenagers can use this information when discussing healthy eating habits. However, these findings are most relevant to teenagers in Brazil and similar settings. Teenagers with medical conditions affecting weight should consult their doctor before making changes
If a teenager starts eating regular meals after skipping them, changes in weight may take several weeks to several months to become noticeable. Weight management is a gradual process. The most important thing is to build consistent eating habits over time rather than expecting quick results. If a teenager does not see changes after a few months of eating regular meals, other factors like overall calorie intake and physical activity should be examined
Frequently Asked Questions
Does skipping breakfast make you gain weight?
Research shows a connection between breakfast skipping and excess weight, especially in girls. A 2026 study of 382 Brazilian teenagers found girls who skipped breakfast were 2.2 times more likely to be overweight. However, this shows correlation, not definitive proof of cause and effect
Is it bad for teenagers to skip dinner?
For boys specifically, skipping dinner appears connected to excess weight. The 2026 study found boys who skipped dinner were 3.1 times more likely to have excess weight. Eating regular dinner may support healthy weight management during teenage years
Does eating snacks instead of meals cause weight gain?
A 2026 study of 382 Brazilian students found no strong connection between replacing meals with snacks and excess weight. The issue appears to be about skipping meals entirely rather than eating different foods instead
How long does it take to see weight changes from eating regular meals?
Weight changes from consistent meal eating typically take several weeks to months to become noticeable. Building regular eating habits is a gradual process. If no changes appear after 2 to 3 months, other factors like overall calorie intake and physical activity should be examined
Why do boys and girls show different patterns with meal skipping?
The 2026 study found girls showed stronger connections with breakfast skipping while boys showed stronger connections with dinner skipping. The reasons are unclear but may involve differences in metabolism, eating patterns, or how different genders respond to meal timing
Want to Apply This Research?
- Track which meals are eaten each day (breakfast, lunch, dinner) and note the time. Record body weight weekly on the same day and time. Over 8 to 12 weeks, look for patterns between meal consistency and weight trends
- Set a specific goal such as ’eat breakfast 5 days per week’ or ’eat dinner every night this week.’ Use the app to send reminders at meal times. Log each meal eaten to build awareness of eating patterns. Gradually increase the number of days per week that all three meals are consumed
- Create a weekly meal checklist showing which meals were eaten each day. Track weight weekly and look for trends over 4 to 8 week periods. Note any other factors that might affect weight like physical activity or sleep. Review progress monthly to see if more consistent meal eating correlates with stable or decreasing weight
This article summarizes research showing associations between meal skipping and excess weight in teenagers. It does not prove that skipping meals causes weight gain. This study was conducted in Brazil and may not apply to all populations. Weight management involves many factors including overall diet quality, physical activity, sleep, and genetics. Teenagers concerned about their weight should consult with a healthcare provider or registered dietitian for personalized advice. This information is not a substitute for professional medical or nutritional guidance. Always speak with a doctor before making significant changes to eating habits, especially for teenagers with existing health conditions
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.