A note before starting
This article is about feelings and motives, not about how to change your weight. It gives no diet, exercise or procedure advice, and it makes no promises about results. Decisions about weight, food and medical treatment belong with a doctor or other qualified health professional who knows your situation. The title uses the words “fat” and “fit” because that is the phrase many people use to describe a perceived before-and-after story, but those words are not moral categories, and a person’s worth does not depend on either.
Why weight carries so much emotion
Weight is visible, widely discussed and often treated as a character reference. People of larger size frequently report being judged, lectured or overlooked, including in health settings. People of smaller size can face their own comments. As a result, weight is rarely just a physical matter. It is tied up with how a person expects to be treated.
That is why weight change tends to stir strong emotions even when it is wanted. Common ones people describe include hope, pride, relief, anxiety about regaining, grief for a former self, and unease when others suddenly act differently. Some feel they have to prove that the change was worth it. Some feel the praise is unsettling, because it implies they were unacceptable before.
Motivations vary
People pursue or experience weight change for many reasons: health concerns raised by a doctor, an illness or medication, pregnancy and recovery, an injury, a new routine, a change in circumstances, or a wish to feel different. Some are motivated by shame, which research and clinical experience suggest can be a poor long-term driver, although individual experiences differ. Some are motivated by wanting more energy or ability to do things they enjoy.
It can be useful, without judgment, to ask what a goal is meant to achieve. “I want to feel comfortable walking upstairs” is a different aim from “I want people to stop commenting.” The second one may not be fully in a person’s control, since other people’s behavior does not follow from the scale.
The link to body modification
There are several ways weight change and body modification intersect.
Marking a milestone. Some people get a tattoo or piercing to mark a change they went through, such as recovery from illness or a major shift in lifestyle. The mark is a memory, not a method.
Dealing with the aftermath. After large weight changes, the skin and body may look different, for instance with loose skin or stretch marks. Some people consider tattoos or medical options in response. Whether any of these is suitable depends on individual health, and a medical consultation is the right place to ask. Tattooing over changed skin has its own considerations, and outcomes are uncertain.
Substituting one change for another. For some, the urge to modify the body can be a way to keep working on appearance when feelings are unresolved. If a person feels they need constant new changes to feel adequate, it can be a sign to talk to someone.
Medical procedures. Procedures such as bariatric surgery are medical decisions made with a care team for health reasons and carry real risks and long-term lifestyle requirements. This article does not discuss whether anyone should have one.
The mind often lags behind the body
A frequently described experience is that a body can change while the internal picture remains the same. A person who has lost or gained weight may still feel, move and dress as though they have the earlier body, and may be startled by their reflection. That is a normal feature of how body image works, which updates slowly.
The reverse also occurs. Someone may expect to feel entirely different after a change and find that old worries persist. This is one reason why researchers and clinicians caution against treating a weight number as the answer to feeling better. Feelings about the body involve many things beyond weight.
Cautions
Disordered eating. Intense preoccupation with food, weight or shape, rigid rules, bingeing, purging, or extreme exercise are signs to talk to a doctor soon. These conditions affect people of every size, including those who appear healthy, and are treatable.
Diet culture messages. Marketing often presents weight change as a moral transformation, with dramatic photos and strong claims. Be wary of anything that promises results or sells certainty. Talk of diet culture helps explain why those messages feel so persuasive.
Permanent decisions in a vulnerable moment. If you are in the middle of a big emotional change, whether about weight or anything else, it is usually wise to wait before getting a tattoo or piercing to commemorate it. Time reveals whether the meaning lasts.
Comparisons. Before-and-after pictures show only two moments and leave out the effort, the setbacks and the other circumstances behind them.
Being kind through change
Whatever the direction of a weight change, a few ideas are widely shared by health writers. Treat your body consistently, whatever its size. Notice who in your life is supportive and who is not. Let people know if you do not want comments on your body. And keep the goals about how you want to live, not only about how you want to look.
For anything concerning your own health, a doctor can give advice that no article can.