Short Term Weight Loss And Hepatic Triglyceride Reduction Evidence Of A Metabolic Advantage With Dietary Carbohydrate Restriction1,2,3

This study examined whether restricting carbohydrates or restricting calories works better for reducing fat buildup in the liver, a condition called nonalcoholic fatty liver disease (NAFLD). NAFLD affects about one-third of adults and occurs when excess fat accumulates in liver cells, often due to insulin resistance and obesity. The liver can make fat from carbohydrates through a process called lipogenesis, which contributes to this fat buildup.

Researchers studied 18 people with NAFLD who followed either a very low-carb diet (less than 20 grams of carbs per day) or a calorie-restricted diet (1200-1500 calories daily) for two weeks. They used magnetic resonance spectroscopy to precisely measure liver fat before and after the intervention. Both groups lost similar amounts of weight - about 4-5 pounds over the two weeks.

The key finding was that while both diets reduced liver fat, the low-carb approach was significantly more effective. The low-carb group reduced liver triglycerides by 55% compared to 28% in the calorie-restricted group - nearly twice as much reduction despite identical weight loss. The researchers found that higher dietary fat intake, lower carb intake, and increased ketone production (a sign the body is burning fat for fuel) were all associated with greater liver fat reduction.

This research suggests that for people with fatty liver disease, the type of diet may matter as much as weight loss itself. In clinical practice, this supports considering carbohydrate restriction as a therapeutic approach for NAFLD, potentially offering faster improvements in liver health than traditional calorie-counting approaches alone.