Let's get real for a sec: The thought of any kind of fasting diet sounds like the exact opposite of fun (and is likely making your stomach growl at the mere thought of it). And yet, it seems to be the weight-loss trend that just won't go away (think: OMAD, and the 5:2 diet).

Now, there seems to be another type of intermittent fasting—alternate-day fasting—that's been making headlines recently. And while the name definitely suggests some longer stretches of time without eating, it's not totally clear what the diet's all about. Here's what experts have to say about alternate-day fasting—and (spoiler!) it's definitely nothing good.

What is alternate-day fasting?

Alternate-day fasting (aka, ADF), is basically a type of intermittent fasting (IF)—a practice in which you alternate between periods of regular eating and fasting (not eating, or severely restricting calorie content). Depending on the IF program, you can fast for a few hours, or a full day or longer.