After gastric bypass surgery, liver fat levels did not decrease significantly even though patients lost a lot of body fat, but when people lost the same amount of weight by eating fewer calories,...

After one month, morbidly obese women who had gastric bypass surgery lost a higher percentage of body fat than those who followed a low-calorie diet, even though both groups lost the same amount of total weight. This suggests that the surgery affects fat metabolism in a way that diet alone does not.

After gastric bypass surgery, levels of free fatty acids in the blood rose and stayed higher than after dieting alone, even when people consumed the same number of calories, suggesting that the surgery increases fat breakdown in the body.

Eating lower-sugar and lower-saturated-fat foods for two weeks doesn’t seem to change how much new fat your liver makes — so if liver fat goes down, it’s probably because of something else.

After weight-loss surgery, changes in bile acids seem to help clean up fat in the liver and improve how the liver responds to insulin—even when people haven’t lost much weight yet.

Losing weight—whether by eating better, exercising, taking medicine, or having weight-loss surgery—can help reduce fat, inflammation, and scarring in the liver of obese people with fatty liver disease.