A list of some of the common ones, please note I am not claiming all of these are correct or effective.
Protein only breakfast, protein + fat lunch, protein + carb dinner (Nate miyaki article)
No calories after 6pm
At least 10 hour period each day with no caloric intake
but also: Never go more than 2 hours without eating to stoke the ‘metabolic fire’
Eat half a lb of greens with each meal
Separate carbs and fat, so meals are either protein + fat or protein + carb
but also: add some fat when you eat carbs, it slows down the release and reduces the insulin response
Drink more water, sometimes you are thirsty, not hungry.
Green tea + caffeine.
Drink lots of coffee, for antioxidants + caffiene and ‘proven’ fat loss benefits
but also: Avoid drinking too much coffee because it can raise cortisol which can hinder fat loss
Use a smaller plate to ‘trick’ your brain into thinking you are eating a bigger meal
Breakfast like a king, lunch like a prince, dinner like a pauper
but also: Skip breakfast to extend your overnight fast.
but also: Never skip breakfast, people who skip breakfast eat on average x% more calories at lunch and dinner
but also: Put most of your calories into the post workout / peri workout window