The Claim
Very-low carbohydrate diets, defined as less than 30% of total energy from carbohydrates, are associated with significantly higher low-density lipoprotein (LDL) cholesterol levels—on average 0.35 mmol/L higher—compared to moderate-low carbohydrate diets (40–45% energy from carbohydrates), particularly when the reduction in carbohydrates is replaced with saturated fats, suggesting a potential increase in cardiovascular risk with extreme carbohydrate restriction.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Eating very few carbs—like on a strict keto diet—can raise your 'bad' cholesterol, especially if you're replacing those carbs with lots of saturated fats like butter and red meat.
See the scientific wording
Very-low carbohydrate diets (<30% energy from carbs) are associated with significantly higher LDL cholesterol levels—on average 0.35 mmol/L higher—compared to moderate-low carbohydrate diets (40–45% energy from carbs), particularly when carbohydrates are replaced with saturated fats, indicating potential cardiovascular risk with extreme carbohydrate restriction.
What the research says
1 studyThe study shows that very-low carb diets raise bad cholesterol more than moderate-low carb diets, especially when people eat more saturated fat instead of carbs, which matches the claim.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.