This is a common criticism of low-carb, but I'm not sure I get why people think this is discovering some deep dark secret. (My frustration is not aimed at you!
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A lot of people find that eating low carb diminishes their appetite, so yes, it can be a lower calorie plan. So what? The key difference for me is that any time I've tried to cut calories in the past, I have been hungry, dissatisfied and was unable to maintain it for very long.
On this WOE, I am never hungry, I eat a huge variety of foods and never feel dissatisfied because I can eat things like cream, hollandaise, nuts, etc. Yes, my appetite has diminished (a good thing!) so I'm taking in less calories. The difference is that this WOE doesn't torture me like low-fat low-cal diets did.
I think that's why most people find this WOE satisfying. They feel great, health conditions get under control and they don't feel deprived. If calories are reduced at the same time, all the better.
In one sense -- all weight loss plans are lower calorie. But most of them are pretty bland and tasteless, thus hard to sustain.