Increasing the amount of oxygen in the air isn't going to magically increase the amount of oxygen your body uses, nor the amount of CO2 you produce. Humans evolved to live in an environment where the air is 21% O2. At that percentage, the typical blood oxygen saturation levels already sit between 95% and 100% for a healthy adult. The body cannot go above 100% O2 saturation. So even though the air is 21% O2 (or less, depending on altitude), your body is pretty much fully saturated with all the oxygen it can get from normal air.
If you actually want to lose weight, you need to make small, compounding changes. Weight loss is as marathon, not a sprint. Any type of crash diet or lifestyle that lets you lose weight rapidly is not sustainable for the vast majority of people.
Start with something easy, like drinking water instead of soda. Start working in a 30+ minute walk a few days a week. Strictly limit (or cut out entirely) alcohol. Choose black coffee over lattes or blended drinks. Avoid the chip and cookie isle in the grocery store. Buy bread from a local sourdough bakery instead of the processed stuff at the grocery store. Gradually increase the amount you exercise. Vary the type so it doesn't get boring. Join a local gym/rec center and play pickleball or racquetball. Take a weekend hiking trip, realize you love spending time in nature and that simply walking around looking at beautiful things is insanely good for you. Just once or twice a week, choose a salad instead of a sandwich. Choose the small portion size. Wait a bit, and see if you're actually still hungry after you eat it. If you are, go ahead and eat more, but listen to your body instead of assuming you need the large. Don't buy stretch clothing - traditional non-stretch fabric will give you instant feedback if you are gaining weight. Spend time with healthy and fit people. It's much easier to make good choices if those around you are making the same choices.
Make just one of these changes per week. After a few months, you'll have completely changed your lifestyle. It creates a positive feedback loop. Living a healthy lifestyle makes you happier. Being happier makes you want to make healthy choices.
If you actually want to lose weight, you need to make small, compounding changes. Weight loss is as marathon, not a sprint. Any type of crash diet or lifestyle that lets you lose weight rapidly is not sustainable for the vast majority of people.
Start with something easy, like drinking water instead of soda. Start working in a 30+ minute walk a few days a week. Strictly limit (or cut out entirely) alcohol. Choose black coffee over lattes or blended drinks. Avoid the chip and cookie isle in the grocery store. Buy bread from a local sourdough bakery instead of the processed stuff at the grocery store. Gradually increase the amount you exercise. Vary the type so it doesn't get boring. Join a local gym/rec center and play pickleball or racquetball. Take a weekend hiking trip, realize you love spending time in nature and that simply walking around looking at beautiful things is insanely good for you. Just once or twice a week, choose a salad instead of a sandwich. Choose the small portion size. Wait a bit, and see if you're actually still hungry after you eat it. If you are, go ahead and eat more, but listen to your body instead of assuming you need the large. Don't buy stretch clothing - traditional non-stretch fabric will give you instant feedback if you are gaining weight. Spend time with healthy and fit people. It's much easier to make good choices if those around you are making the same choices.
Make just one of these changes per week. After a few months, you'll have completely changed your lifestyle. It creates a positive feedback loop. Living a healthy lifestyle makes you happier. Being happier makes you want to make healthy choices.