I'm very leery of plans like this. When you fast your body uses lean muscle mass for energy. Not sure if this is the case here since 19 Hours isn't really a long time. But losing muscle is detrimental in the long run. When you do Atkins you lose fat rather than lean muscle.
Any plan that allows you to eat all you want of any kind of food isn't likely healthy, if you are eating mostly healthy foods that would be different.
For most people fasting leads to binging. I don't think it is a great idea to eat nothing during the day and eat a lot in the evening, when I occasionally miss breakfast and lunch I find I'm more likely to over eat and make less healthy food choices. I think it would be better if you want to have one big meal you would be better of to have it in the AM.
The only link that worked for me was the third one. It seem like the reasoning given here is due to insulin levels being low during the fasting period, likely the rats where fed high carb, grain based diets. When you do Atkins it keeps your insulin levels low all the time anyway and increases insulin sensitivity without fasting. So with Atkins you get the same insulin lowering benefit as fasting but without the muscle loss and without the hunger.
Good luck if you do try it, let us know how it works out for you.
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