Do you have to get up quite early in the morning? Only reason I ask is because half the day being the time until 12 is surprising -- after your midday meal, if you've constructed your meal properly, you should ideally not be hungry until dinner. I think IF needs to be paired with a mindfulness about what you're eating -- having toast with butter for lunch will not work.
Usually like 7:30. Had to get kids to school. I always eat pretty wholesome food with lots of whole grain and vegetable. When I was doing IF, I needed a big lunch to regain my senses and frequently didn't make it to 6PM without needing another dose of food. I suspect I was fitting my normal calorie intake in that window. If the goal was to somehow trick my metabolism into wanting fewer calories, I don't think it worked at all.
