According to Gram Research analysis, a 2026 cross-sectional study of 290 overweight and obese women found that eating fewer carbohydrates was significantly associated with lower belly fat, reduced body fat percentage, smaller waist circumference, and higher good cholesterol levels. For every increase in low-carb diet score, women had approximately 0.77 kg less visceral fat, 1.043% less overall body fat, and 1.98 cm smaller waist measurements.
A study of 290 overweight and obese women found that eating fewer carbohydrates was linked to losing belly fat, reducing body fat percentage, and improving cholesterol levels. Researchers measured how much carbohydrate each woman ate and compared it to changes in their body measurements and blood work. Women who ate fewer carbs had smaller waist measurements, less visceral fat (the dangerous fat around organs), and higher levels of good cholesterol. The findings suggest that low-carb eating may be particularly helpful for women struggling with weight and belly fat.
Key Statistics
A 2026 cross-sectional study of 290 overweight and obese women found that higher low-carbohydrate diet scores were significantly associated with lower obesity degree and reduced visceral fat by approximately 0.77 kg.
According to research reviewed by Gram, women with higher low-carb diet scores had 1.98 cm smaller waist circumference and 1.043% less body fat percentage compared to those eating more carbohydrates.
A 2026 study of 290 women found that low-carbohydrate diet scores were significantly associated with higher HDL cholesterol (good cholesterol), with a p-value of 0.041, indicating a statistically significant relationship.
The Quick Take
- What they studied: Whether eating fewer carbohydrates helps overweight and obese women lose weight and improve their body shape and blood cholesterol levels
- Who participated: 290 women aged 18-48 years old who were overweight or obese (with a BMI over 25). Researchers measured their diet, body composition, and blood work.
- Key finding: Women who ate fewer carbohydrates had significantly lower belly fat, smaller waist measurements, less overall body fat, and higher levels of good cholesterol (HDL)
- What it means for you: If you’re an overweight or obese woman looking to reduce belly fat and improve cholesterol, a low-carb diet may help. However, this study shows association, not proof of cause-and-effect, and results vary by individual. Consult your doctor before making major dietary changes.
The Research Details
This was a cross-sectional study, which means researchers looked at a group of 290 women at one point in time and compared their eating habits to their body measurements and blood work. The women completed a detailed food questionnaire with 147 items to measure how many carbohydrates they typically ate. Researchers then calculated a “low-carbohydrate diet score” for each woman based on her answers.
The researchers measured body composition using bioelectrical impedance analysis, a safe method that sends a small electrical signal through the body to estimate fat and muscle. They also took standard measurements like waist circumference and collected blood samples to check cholesterol and blood sugar levels. They adjusted their analysis to account for factors that could affect results, including age, total calories eaten, physical activity level, education, and economic status.
This approach allowed researchers to see if women eating fewer carbs had different body measurements and blood profiles compared to women eating more carbs, while controlling for other factors that might influence the results.
Cross-sectional studies are useful for identifying patterns and associations between diet and health outcomes. By measuring multiple factors at the same time, researchers can see whether certain eating patterns are linked to better body composition and cholesterol levels. This type of study is efficient and can include many people, making it good for initial investigation. However, it cannot prove that low-carb diets cause weight loss—only that they’re associated with it.
Strengths: The study included a reasonably large sample (290 women), used a validated food questionnaire with many items, measured body composition with a scientific method, and adjusted for multiple factors that could influence results. Limitations: This is a cross-sectional study, so it shows association but not cause-and-effect. The study only included women aged 18-48, so results may not apply to men or older women. The study was conducted at one point in time, so we don’t know if these associations hold over longer periods. Dietary information was self-reported, which can be less accurate than measured intake.
What the Results Show
Women with higher low-carb diet scores had significantly lower obesity degree (a measure of how obesity affects body shape), with a p-value of 0.041, meaning this finding is statistically significant. For every increase in low-carb diet score, women had about 0.77 kg less visceral fat (the harmful fat around organs), 1.043% less body fat overall, and 1.98 cm smaller waist circumference.
The study also found that women eating fewer carbs had higher levels of HDL cholesterol (the “good” cholesterol that protects heart health), with a p-value of 0.041. This is important because HDL helps remove other types of cholesterol from the bloodstream.
Interestingly, the low-carb diet score was not significantly associated with ABSI (a body shape index that measures how fat is distributed), even after adjusting for age, energy intake, and physical activity. This suggests that while low-carb diets may help reduce overall fat and belly fat, they may not change body shape distribution in the way this particular index measures.
The study found that the relationship between low-carb eating and reduced body fat remained significant even after researchers controlled for potential confounding factors like age, total calories eaten, physical activity, education level, and economic status. This strengthens the finding that the association is not simply due to these other factors. The improvements in waist circumference and visceral fat were particularly notable, as these are strong indicators of metabolic health and disease risk.
Previous research has shown that low-carb diets help with weight loss and improve cholesterol and blood sugar control. This study adds to that evidence by showing that low-carb diets are specifically associated with reductions in visceral fat and waist circumference in overweight and obese women. The finding about improved HDL cholesterol aligns with previous research showing that low-carb diets can improve lipid profiles. However, the lack of association with ABSI (body shape index) is a new finding that suggests low-carb diets may not affect how fat is distributed across the body in the way this particular measurement captures.
This study has several important limitations. First, it’s cross-sectional, meaning it captures a snapshot in time and cannot prove that low-carb diets cause weight loss—only that they’re associated with it. Second, the study only included women aged 18-48, so results may not apply to men, older women, or younger girls. Third, dietary information was self-reported through a questionnaire, which can be less accurate than measured food intake. Fourth, the study doesn’t tell us how long women maintained their low-carb eating or whether the benefits lasted over time. Finally, the study was observational, so unmeasured factors (like stress, sleep, or genetics) could influence the results.
The Bottom Line
For overweight and obese women, reducing carbohydrate intake appears to be associated with lower belly fat, reduced overall body fat, smaller waist circumference, and improved good cholesterol levels (moderate confidence based on cross-sectional evidence). This suggests a low-carb approach may be worth discussing with your doctor or dietitian. However, this study shows association, not proof of cause-and-effect, and individual results vary significantly. Any major dietary change should be discussed with a healthcare provider, especially if you have diabetes, heart disease, or take medications.
This research is most relevant to overweight and obese women aged 18-48 looking to reduce belly fat and improve cholesterol. Women with metabolic syndrome, prediabetes, or high cholesterol may find this particularly relevant. However, the findings may not apply to men, older women, or people with certain medical conditions. People with a history of eating disorders, kidney disease, or those taking specific medications should consult their doctor before adopting a low-carb diet.
Based on this cross-sectional study, we cannot determine how quickly benefits appear. Other research suggests that improvements in waist circumference and body fat may begin within 4-8 weeks of consistent low-carb eating, but individual timelines vary. Cholesterol improvements may take 2-4 weeks to become apparent in blood work. Sustained benefits require maintaining the dietary change long-term.
Frequently Asked Questions
Does eating fewer carbs help you lose belly fat?
A 2026 study of 290 women found that eating fewer carbs was associated with 0.77 kg less visceral belly fat and 1.98 cm smaller waist circumference. However, this shows association, not proof of cause-and-effect. Results vary by individual.
Can a low-carb diet improve cholesterol levels?
Yes, the study found that women eating fewer carbs had significantly higher HDL (good) cholesterol levels. This is important because HDL helps remove harmful cholesterol from your bloodstream and protects heart health.
How much body fat can you lose on a low-carb diet?
This study found that for every increase in low-carb diet score, women had 1.043% less body fat. However, this is an association study showing a snapshot in time, not a weight-loss trial, so individual results will vary based on starting point and consistency.
Who should try a low-carb diet based on this research?
This study focused on overweight and obese women aged 18-48. If you fit this description and want to reduce belly fat or improve cholesterol, discuss a low-carb approach with your doctor. It may not be appropriate for everyone, especially those with certain medical conditions.
Does a low-carb diet change your body shape?
This study found that low-carb diets reduced belly fat and waist circumference but were not significantly associated with changes in body shape distribution (measured by ABSI). So while you may lose inches, your overall body shape pattern may not change dramatically.
Want to Apply This Research?
- Track daily carbohydrate intake (in grams) and measure waist circumference weekly. Record your carb intake at meals and note any changes in how your clothes fit or energy levels. This creates a personal data set to see if reducing carbs affects your measurements over time.
- Start by identifying your highest-carb meals and snacks, then replace one high-carb item per day with a protein or healthy fat option. For example, swap bread for eggs at breakfast or pasta for zucchini noodles at dinner. Track these swaps in the app to build consistency and see patterns.
- Measure waist circumference monthly and track it in the app alongside your average daily carb intake. Set a target carb range based on your doctor’s recommendation and monitor adherence. Check in with blood work (cholesterol and blood sugar) every 3-6 months to see if improvements match the study findings.
This research shows an association between low-carbohydrate diets and reduced belly fat in overweight and obese women, but does not prove cause-and-effect. This study was cross-sectional and only included women aged 18-48, so results may not apply to men, older adults, or other populations. Before making significant dietary changes, especially if you have diabetes, heart disease, kidney disease, or take medications, consult with your doctor or registered dietitian. Individual results vary, and this information should not replace professional medical advice. The study measured associations at one point in time and does not indicate long-term safety or effectiveness of low-carb diets.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.