I'm far from being an expert, but the CO2 is just a byproduct of your body's metabolism. And although oxygen only makes up 21% of the air, your lungs don't extract 100% of it and even if it did, it wouldn't get used, or you would pass out. Or even worse, you would get used to having 100% oxygen delivered to your lungs, your red blood cell count would drop and then you would pass out as soon as you stopped using the O2 tank.

I've read a comment about gut bacteria, and I've also read a study about it and I was able to lose weight. If you think about types of gut bacteria that are helping you digest your food like little populations, you need to stop eating bad food like pizza, fast food, etc so that you can starve the population that's constantly secreting hormones that make you hungry for that kind of food. Then the craving goes away.

Declare war on those bacteria. No, it's no easy, it's pain and suffering. The first two weeks are hell. Then it gets easier and easier.

What I did was: - Sunday I cook meals for the week, two small portions every day. - Two options of tasty but healthy food. - Like mashed potatoes and grind meat or chicken and rice. - One small cake that should last the entire week as an emergency craving snack. - A ton of fruits. - A cheat meal on Saturday.

Do your best to stick to it, if you feel hungry you can try to eat one more portion, or fruits and in the worst case, a piece of cake.

The cake should also be very 'fit' like carrot cake with no fillings or frostings.

I have no weird tips or hacks, I've tried and fooled myself too many times.

There are no cheats, there are no tricks.