Carbohydrate Restriction Induced Elevations In Ldl Cholesterol And Atherosclerosis

This groundbreaking study examined a concerning phenomenon that sometimes occurs with ketogenic diets: dramatic increases in LDL ("bad") cholesterol levels. Researchers focused on a group called "lean mass hyper-responders" - metabolically healthy, lean individuals who develop extremely high LDL cholesterol (above 190 mg/dL) when following low-carbohydrate ketogenic diets, despite having good HDL cholesterol and low triglycerides.

The study compared 80 people following ketogenic diets with very high LDL levels (averaging 272 mg/dL, with some reaching 591 mg/dL) to 80 matched individuals with normal LDL levels (averaging 123 mg/dL). All participants underwent advanced heart imaging to measure coronary artery calcium scores and detect arterial plaque buildup - key indicators of heart disease risk. The keto dieters had been following their eating pattern for an average of 4.7 years.

Surprisingly, despite having LDL cholesterol levels nearly 150 points higher on average, the ketogenic diet group showed no greater amount of arterial plaque or calcium buildup in their heart arteries compared to the control group. The researchers also found no correlation between LDL cholesterol levels and actual plaque burden in either group, challenging conventional assumptions about cholesterol and heart disease risk.

This research suggests that the dramatic LDL increases some people experience on ketogenic diets may not translate to increased cardiovascular risk, at least in metabolically healthy individuals over a 4-5 year timeframe. However, this represents emerging science that requires longer-term studies and should inform personalized discussions between patients and their physicians about diet choices and cardiovascular monitoring.