I keep bumping into articles on the intertoobs about the supposed health benefits of a "modified fast" once a week. To clear out your liver or some such 18th century homeopathic science fiction.
But the fact is, once a week or so I actually DO a modified fast already. A highly modified fast. I call it "eating normally". You know, three meals plus snackies? Yeah. I do that. About once a week.
A few more days a week I also tend do do a less-modified fast -- I just eat my two regular meals and snackies really fast!