Both sugar and cholesterol contribute to cardiovascular disease, but their mechanisms and relative impact differ.
Cholesterol, specifically elevated low-density lipoprotein cholesterol (LDL-C), is a well-established causal factor in atherosclerotic cardiovascular disease (ASCVD).
Lowering LDL both by primary and secondary prevention, is recommended.
Primary hypercholesterolemia leads to endothelial dysfunction and low-grade inflammation, driving atherogenesis and increasing risk for myocardial infarction and stroke.
Sugar, particularly added sugars and sugar-sweetened beverages, is associated with increased risk of coronary heart disease (CHD) and other cardiovascular outcomes.
High intake of added sugars raises triglyceride levels, promotes hepatic de novo lipogenesis, and may increase blood pressure, independent of body weight effects.
It is recommended to limit added sugar intake.
Prospective cohort studies and meta-analyses show that higher consumption of added sugars and sugar-sweetened beverages is associated with increased CHD and CVD risk.
LDL-C is a direct and primary driver of atherosclerosis and ASCVD, while excess sugar intake contributes to cardiovascular risk mainly through dyslipidemia, especially hypertriglyceridemia, hypertension, and metabolic dysfunction.
Both should be targeted in prevention strategies, but LDL-C reduction remains the cornerstone of ASCVD risk management, whereas sugar reduction is essential for broader cardiometabolic health.
Elevated LDL cholesterol remains a well-established risk factor for atherosclerosis and cardiovascular disease.
LDL particles can become oxidized and trapped in arterial walls, contributing to plaque formation.
Small, dense LDL particles are more atherogenic than large, buoyant ones.
HDL cholesterol generally provides cardiovascular protection by facilitating reverse cholesterol transport.
Dietary cholesterol has less impact on blood cholesterol levels than once thought for most people, due to compensatory mechanisms in cholesterol synthesis.
Excessive sugar intake, particularly fructose and added sugars, can significantly impact cardiovascular health through multiple pathways:
Promotes insulin resistance and metabolic syndrome Increases triglyceride level. Shifts LDL particles toward the more dangerous small, dense phenotype Contributes to inflammation and oxidative stress Can raise blood pressure
Added sugars and refined carbohydrates appear more problematic than sugars from whole fruits, which come with fiber and other beneficial compounds.
Research suggests that sugar and refined carbohydrates may be more significant drivers of cardiovascular disease than previously recognized, while the role of dietary cholesterol has been somewhat de-emphasized.
Sugar’s contribution to insulin resistance, abdominal obesity, and metabolic dysfunction may be a more direct pathway to cardiovascular disease than cholesterol alone.
Excess sugar consumption promotes chronic low-grade inflammation, which is now recognized as a key factor in atherosclerosis development.
The most protective dietary patterns tend to be those that limit added sugars and refined carbohydrates while emphasizing whole foods, regardless of their natural cholesterol content.
Both factors likely contribute to cardiovascular disease.