According to Marion Nestle at Food Politics, it’s all about finding something that you can stick with:
Some people find it easier to stick to diets that are higher in protein and fat. I’m guessing that proponents of low-carbohydrate diets will argue that none of the diets in this particular study was really low in carbohydrate.
But studies show that people have a hard time adhering to diets that are very low in carbohydrate. The low range in this study—35%—is at the lower end of acceptability for many people.
The bottom line: all diets work if you stick to them.
I’ve found that just focusing on eating healthy food and getting plenty of exercise works for me. What works for you?