It's always been a fantasy that when my piggy finally gets the "you're killing yourself" talk, to record it and play it in her headphones immediately after while she's blinded and force fed a sheet cake, only letting her cum if she finishes the last big slice herself.

From then on I'd add an additional crisco and melted ice cream shake for every visit that involves morbid scolding.

Basically your skin has to be torn to shreds to make room. Luckily, instead of exploding, you just get stretch marks. Also, once you're massive, it will take a lot more weight gain to stretch out your skin (your volume to surface ratio increases as you grow, if you were to consider yourself a spherical cow), which gives your skin more time to sag.
There's also genetics to consider--some people are just saggier.

Death isn't really the GOAL (not that I can speak for everyone.) It's knowing that death is looming, that every pound bring it even closer, but they/you can't or won't stop. It's having health issues that are a clear sign that you're on thin ice...but the food keeps getting forced down, the weight keeps piling on. When the ice breaks it's just over...but seeing how far out you can go is as exciting as it is scary. Some people turn back just in time, but with a frostbite reminder, some stick it out part way and suffer the cold. Either way they'll never be 100%. There will always be a chilling reminder of how close they got, and a temptation to step back out onto the ice.

You have to read through all of her replies for your answer.

At that point you never let the pain of an overstretched gut subside. Make them realize what it means to be trapped.

Some people are immobile at 400 lbs, some people can still (eventually) waddle to a commode at 800 lbs. It depends on a lot of factors.

Even more encouragement to get fatter faster and go for a heart attack

Don't listen to her, she's just here up be a killjoy. Immobility is hot, but it tends to be relatively short lived because it requires the most care and causes the most health problems, so at that point you either fatten until you die in a few years, a great way to go, or pragmatism/finances/fear take over and you lose enough to somewhat take care of yourself. This is why riding the line of immobility is also pretty hot. By the time you're big enough to almost be immobile, for it to be a real worry, you're only one small injury away from that tilling point. Hurt your legs, hips, or back in any way and by the time you're healed you'll be too weak and fat to get up without help. Even if you're vigilant and try your best to diet and exercise, a sprain could keep you in bed for a year. At that point you might as well just accept your fate and let your evil feeder stretch your skin to it's limits.

That being said there are many super fats who have lived contently and fairly independently while riding that line. Summer was massive, over 650lbs but she did mostly everything for herself and was very happy slowly meandering about on her own and taking care of herself. Gina could get up (with grabholds) at over 700 lbs. Ash has been massive and maintaining for quite some time, and Heather is over 600 and in her 50's and she slowly gets around. Echo is barely mobile but she can still stand after enough rolling and shimmying. Vanillahippo is 800 lbs and can still stand without help. If you can't stand without help, and you have a feeder, you're passed the point of no return even if you can still walk. You'll find them helping you less and less and you won't complain, you'll grow complacent, and get off on it, and tell yourself you'll do something about it later...but you won't

While this definitely isn't strictly a death feedist forum (sub forum?), you're coming off a bit preachy theeerrreeee fella (/Brak).

Regardless of whether they get off on it or not, the feedees and feeders here are perfectly aware that there are health risks and don't need you to explain to them what a BRILLIANT idea it is to try not to suffer and die.

A simple enough post would be: "Healthy lifestyle tips for gaining mega chonkers?"

A hot post would be: "How to suffer in constant agony under the crushing weight of my 800 lb completely useless body for as long as possible before my heart literally explodes"

Takes all kinds!