I've done that routinely for years. I didn't know it was a thing. Once or twice a week I go about 16 hours without eating, then eat one meal that day. Just drink fluids. Usually I'll do it if I've been feeling a bit bloated. Seems to help.

No particular goal. Not weight loss or anything else. If I happen to have a free day at home where I'm unlikely to experience a blood sugar bonk I'll just do it. Sometimes I get a little peckish but it's not a thing where I feel like I'm sacrificing anything.

I wasn't even sure it helped or hurt weight loss efforts. There are conflicting theories, including a theory that fasting causes the body to retain or gain weight. Who knows. That wasn't my goal. My weight has come of primarily due to exercise and being more careful about what I eat.