Diet adherence
Only one person dropped out of the 5:2 group, compared with five in the LCHF group and four in the standard-care group. More people in the LCHF group reported adverse events, such as gastrointestinal upset.
“With LCHF, it’s a drastic change for most people,” Dr. Holmer said. “Many patients are a bit shocked when they realize how much fat they are supposed to eat for breakfast, for lunch, and for dinner. They might eat bacon and eggs for breakfast every day.” The diet could be challenging for people who want to reduce their consumption of meat for environmental reasons.
The 5:2 group offers the advantage that people can choose what they want to eat as long as they adhere to the calorie restrictions, he pointed out. Still, he cautioned that the diet would not work well for people with insulin-dependent diabetes because of the difficulty of adjusting insulin levels on fasting days. He also recommended against this diet for people with cirrhosis because they need to eat frequent meals.
LCHF and 5:2 diets can work
But for most people the good news is that a variety of diets will work to treat NAFLD, Dr. Holmer said.
“I begin with saying to my patients that this can be completely cured, as long as you’re able to lose weight,” he said. “Then the next question is, how are they going to go ahead with that task? And if they’re already interested in some sort of specific diet, then I can, based on these findings, encourage that.”
Stephen Harrison, MD, a visiting professor of hepatology at Radcliffe Department of Medicine, University of Oxford, England, said that longer-term results will be important. For example, it will be interesting to see if the diets had effects on ballooning or inflammation.
Another limitation of the study is that it is relatively small in size, he said. He pointed out that people with NAFLD should increase their physical activity as well as eating less.
Still, Dr. Harrison greeted the findings enthusiastically, saying: “This is an important study.”
It’s useful to compare two popular diets head to head, and it’s also encouraging to get confirmation that either one can work, he added.
The study was supported by grants from the Stockholm County Council, the Dietary Science Foundation (Kostfonden), the Skandia Research Foundation, and the Åke Wiberg Foundation. Dr. Holmer has disclosed no relevant financial relationships. Harrison is a consultant to Madrigal Pharmaceuticals.
A version of this article first appeared on Medscape.com.