15 a day without eating is difficult to persist, and it takes considerable perseverance, so it is difficult to persist. So, in fact, as long as you don't eat a few dinners a day, the effect is the same as that of not eating a day (really, I tried). It's easier to stick to it.

But if you eat nothing during the day and have a meal at night, the effect is the same as eating a meal all day (I tried this! )。

So, I don't think you need to endure such a hard day. Just don't eat a meal at night!