Gosh, it really makes me sad that there are people who would be so concerned about their physical appearance they would go to the lengths of making themselves vomit. It's so dangerous to ones health. The esophagus can become ulcerated, the abdominal muscles experiencing tears and pressures they should not, various internal organs like the kidneys being upset by it, the back and neck muscles, the enamel on teeth being damaged and the tastebuds on the tongue, the sinuses, the heart, and the brain.
Natural vomiting, in response to illness, is a good thing. Unnatural vomiting is not.
The human body was designed over time for more and more Movement. We are not out of that phase of Evolution yet. A lack of movement contrtributes to many, many problems on health. Depression and weight gain are two big results of it.
I was seriously injured once during a phase of my life where I was extremely physically active and an athlete. Being 'in shape' made it possible for me to survive it.
I suffered another injury that precluded physical activity. It wasonly years of training with coaches and various other sports professionals that I had the knowledge to survive the last few years while recovering from it. In these years, I've managed to avoid putting on only but a few extra pounds. Still, I did lose a bit of muscle tone but managed to slow that decline too much. I hope to get it back but it will take time.
A lot of people you see that are over-weight are not overweight because they're lazy, gluttonous morons. Many of them have underlying medical conditions and medications they take that contribute to weight gain, regardless of what they 'do'. Disability in the physique, for whatever reason, can and usually does impact the mechanical aspects of movement and so this, too, contributes to weight gain for people. Some people with Epilepsy often are overweight because medications they take slow them down and also too much physical stress can trigger seizures.
So, be a little kinder in your mind to yourself if what you see in the mirror can be explained by these things, and be a little kinder in your mind to strangers you see who are 'fat'. You never know for sure what's influencing people or what they are dealing with in their lives.
Maybe Kindness and Compassion are things that should be added to our 'diets'