I would be careful with the oxygen thing. Not sure if it would work either, since if oxygen were the limiting factor you'd probably feel it. Number one tip is

I would be careful with the oxygen thing. Not sure if it would work either, since if oxygen were the limiting factor you'd probably feel it. Number one tip is this. Spend money on a real life internet personal trainer. I have one, I think of him when I'm about to eat something I shouldn't. Weird how a stranger can provide accountability. Two, buy a Bluetooth scale with two decimal places of precision. Super easy to weigh and record each day. You can literally see the weight loss during sleep, it's a good few hundred grams a night. You can also weigh your toilet visits, haha. Three, and this is from my coach. Eat enough. Don't try to have a mega deficit, that can only work temporarily. Have a moderate deficit and hit your macro ingredients count, a third of your calories each.