SPAM is legit. I lost about 4lbs of body fat(in addition to like 6lbs of water) in about 6-8 days.
The downside, is that you literally feel like you're in the advanced stages of AIDS(less the vomiting). I had no energy, could not think clearly, it was awful. Apparently some people adapt at some point. I just didn't feel it was worth it. I can cut about 8 lbs in a month on a tight diet. I'd rather lose weight half as quickly and not feel like I'm terminally ill while doing so.

The only people I'd really suggest SPAM to, are people suffering brain damage. It's been shown to radically improve their condition. But since I'm healthy now... I'm not going to do it again.

Try IF for 20/4.

Count your calories, have your macros in balance (35-30-35), do some HIIT and you'll be golden.

That's the best way of cutting. Have 3 sessions of strength training and 3 of HIIT training per week. Eat enough protein to lose as little muscle mass as possible.

Train faster whenever possible.