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I am making the assumption that the lungs can handle being 100% saturated.I would do some reading about that before trying it.
The "weird tip" I have is this: Do many different diets, sequentially.
Most of us who have been significantly overweight and spent time dieting will have noticed that in the first weeks or months of a new diet (keto, low calorie, paleo, vegetarian, unprocessed-food-only, or whatever), it works well, it's easy or not-too-hard to stick with, you feel great, and the numbers go generally down.
Eventually, the numbers aren't going down noticeably, you no longer notice feeling great compared to last week or last month, and even though you're eating exactly the same thing as you were a month ago, now it's unappetizing and always leaves you wanting more. You're not looking forward to the next meal, and the cravings are enormous.
Congratulations! If you have iron will, you can just stay in this mode, live an ascetic life, and your weight troubles are over.
Many of us do not have iron will, it turns out.
Portions we have to measure start increasing a bit. We convince ourselves that we'll have a few more calories right now but a few less tomorrow. If we miss some calories due to circumstance on day N, we feel entitled to "reward" ourselves with at least most of those calories on day N+1, when the surplus will certainly be stored.
But, didn't we start out by saying we know how to lose weight for a few weeks or months? That happens when starting a new diet, right? Sure, eventually the downward trend flattens, we get less strict or stop constant reminders not to snack and to carefully measure each portion of everything, and maybe even go "off" the diet for a while. For a lot of people, this is when all the lost weight plus a few units comes back.
What if we found a way to keep our diet interesting without increasing caloric intake, without eating a lot of diet-specific hacks ("I'll just replace all the sugar with xylitol!") and without spending more and more time researching and preparing slightly different recipes? What if we could do this without portions slowly sliding up, and without massive cravings?
So, that's the idea: Try (e.g.) low carb. Dive in, read all the popsci that cherrypicks studies, etc. Watch the scale numbers decrease. At the first hint of boredom ("I only have broccoli, eggs, and steak in my fridge. Ugh!"), figure out another diet to do! Dive into Weight Watchers! Read supportive articles about how WW is all you need, and load up your fridge with WW meals. After a few months, when you are tired of the thought of eating yet another one of those WW meals (but before you've started adding 5 points every other day), figure out another diet to do!
Will this work long-term? I don't know yet, and even if I lose 100 kg on this diet, it'll still be a single data point, so... ¯\_(ツ)_/¯