Why is it so hard to keep weight off?

Now that I read this article it suggests that because of our slowing metabolism after weight loss has occurred, calorie restriction is the only way to permanently keep the weight off. I’ve also read some articles that support the premise of fasting for 24 hours.

http://www.theguardian.com/lifeandstyle/2016/aug/22/why-so-hard-to-keep-wieght-off-obesity?CMP=Share_AndroidApp_Gmail

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Why is it so hard to keep weight off?