It's clear who in here has never dealt with food addiction. Food addiction is the hardest addiction to overcome because you can't just simply not eat. A drug addict can stop doing the drugs with enough intervention and treatment. A food addict still has to eat. For many, just like with drugs, the addiction is tied to a greater underlying condition such as depression, anxiety, PTSD, various hormonal syndromes, illnesses, etc...
I was pretty close to a food addict for many years, I didn't get super heavy but I think I would be dead in a short time if I got my BMI into the mid 30's for too many years. My body just doesn't do well in that situation.
I can see how people fall down the hole though. Inactivity makes them feel bad(mentally and physically), more food feels good, but their body feels worse, so exercise seems even tougher, so they feel bad, eat more again.... I felt pretty bad, sore back, sore knees, I would get shin splints if I ran... Finally I just started running on grass where my shins didn't hurt as much and did a short distance every day until I could run longer and faster with less pain. Some regular core exercises fixed my back, and some leg exercises fixed my knees.
Finally doing some strenuous regular exercise helps me anyways, walking isn't enough for me, but if its all a person can do, then they should start there.
Push ups(in the most difficult form they can do), sit ups, stairs, walking up big hills, etc. Whatever it takes to feel winded and a bit of discomfort. Do 1 minute of it a couple times a day, then 5, 10 minutes, eventually switching over to a single, 20, 30, 60 minute session.
For me anyways, doing 3-4-5 times a week of real heavy sweating, heavy breathing exercise for 30-60 minutes makes me feel way better and not want to pound back 6 drinks and a big bag of potato chips after supper every night, or eat half a cheesecake.