re: Any negatives to fasting 20+ hours on the weekends?

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It's unhealthy because you are essentially idolizing the junk food on the weekends. If you get a hold of yourself during the week, you can just have smaller portions and have it enough where you don't crave anything. It's not a big deal to only have one oreo, where if you constantly associate oreos with "I won't have this until next weekend, must get all I can now", you'll have an unhealthy relationship with that food down the line.

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I sort of agree, but on the other hand pigging out on calorie dense food in a small window then abstaining for a lengthy period is probably more in line with human evolution and historical behavior.