Speaking from experience in this paragraph, relying on your parents takes away a lot of the freedom of dietary choice. Say they notice you getting a little too heavy, they'll likely switch to healthier choices for the household, if not outright enacting strict portion control on you personally. Even worse when you don't have your own sources of income, you won't be able to even order takeout for yourself.
Definitely prioritize getting to be independent first.
Then you can eat as much of anything you can afford, and maybe even find someone who'll pitch in and feed it all to you while you trundle your way past the next few hundred pounds. Can't say I've ever found a long-term feeder willing to take me all the way up to (or for me, beyond) 800lbs, but I have yet to ask (gaining my independence first! It's sexy.)
As for your original question, I imagine approaching 800 pounds would put you into a severely limited mobility state, requiring something like a walker or at least a cane to move any amount of distance. You might be tempted to just quit getting up and walking altogether, for it will be exhausting, and all the added weight would be a significant strain on the joints in your legs and feet. Even something as simple as laying in a bed would require a bit of preparation, equipment and care.
Luckily there's tons (lol) of bariatric equipment and resources available to the public. so you and your partner can have exactly what you need to maintain comfort at whichever stage you're at. You will almost absolutely have to have a serious, committed partner fully aware & willing to help set you up for this and continue towards your 800 pound goal.
If you're thinking still about how thrilling that size must feel, I can't put that feeling into words but I feel the same way about it. I'm no expert & haven't met any yet, but that's what I've osmosed and speculated so far. Hope we reach our goals uninterrupted & enjoy the ride there.
3 years