Coworkers Praised His 38-Pound Loss. It Was Type 1 Diabetes.

The belt is what Mark kept.

He had worn it to work through five months of shrinking waistbands, missed lunches and compliments that arrived so regularly they began to sound like confirmation. In October 2023, he weighed 196 pounds. By March 2024, he was 158. He made another hole in the belt with a screwdriver because replacing it felt unnecessary.

Mark is a composite, built from accounts of adults whose type 1 diabetes appeared after childhood. He lives in suburban New Jersey, shares custody of his 12-year-old son and works in operations for a regional supplier. At 46, he had spent years trying to lose the weight that settled around his middle after his divorce. When it finally came off, he believed he understood why.

His workdays had lengthened. Lunch was often whatever he could eat between problems, and on the weeks his son stayed with his other parent, dinner might be crackers at the kitchen counter. The explanation was ordinary enough to survive without much inspection.

Coworkers noticed after the first 15 pounds. One told him, “Whatever you’re doing, keep doing it.” Another asked whether he had cut out carbohydrates. Mark said he was eating less, which was true, though it was no longer the whole truth.

By then he was also waking at night to drink water and use the bathroom, and the fatigue he blamed on work had begun following him through weekends.

The belt moved in another notch.

Five months of explanations

At first, the weight loss felt earned. Mark had stopped buying takeout as often. His face looked narrower in video calls. A jacket that had pulled across his stomach closed without effort, and the approving remarks supplied a story that his body seemed willing to support.

There were interruptions. His vision blurred while he read a spreadsheet, then cleared. He developed a thirst that a large bottle of water did not settle. During a December custody week, his son remarked that Mark was going to the bathroom a lot.

Mark said he had been drinking more water because the house was dry.

He did not record any of this. He recorded his weight.

A phone app showed 181 pounds in December 2023 and 169 in February 2024. The descending line pleased him even after he noticed that meals no longer explained it. On days when he ate a full dinner with his son, the number still dropped. His appetite sometimes sharpened rather than disappeared, yet the compliments continued because the visible result looked familiar and socially approved.

In January, Mark mentioned the loss during a primary care visit for a lingering cough. He described longer shifts and skipped meals before he described the thirst. The doctor looked at the earlier weight in his chart and said, “That is a significant change.” Routine blood work was ordered, but Mark postponed the lab visit during a busy week and did not reschedule.

The missed test mattered. So did the frame around it. The conversation treated weight loss as something that might need checking, while the people around Mark treated it as proof that he was doing well. He left with concern written into his visit summary and congratulations waiting at work.

By early March, climbing the stairs at home required a pause. His mouth stayed dry. He had begun buying smaller work pants, though the belt still held them, and he felt vaguely embarrassed by how much he enjoyed being asked for his “secret.”

There was no secret. There was an illness using up the body’s available fuel while sugar accumulated in his blood because he no longer had enough insulin to move it where it was needed.

Mark did not know that yet.

The emergency visit

The change came during a weekend when his son was with him. Mark had been nauseated for most of the day and could not keep water down. His breathing became deep and labored. When he stood, the kitchen shifted out of focus, and he sat on the floor rather than risk falling.

His former spouse drove him to the ER. The belt went into a hospital belongings bag with his pants.

Testing showed a blood glucose level above 500 and an acid buildup associated with severe insulin shortage. The emergency doctor told him he was in a dangerous metabolic crisis and had newly recognized diabetes. Mark remembers saying that diabetes ran in his family, though relatives had developed type 2 diabetes later in life. The distinction seemed academic while staff attached monitors and began treatment.

His age initially pulled the conversation toward type 2. That assumption is common enough to sound reasonable, which is part of the problem. Type 1 diabetes is often associated with children, but adults can develop the autoimmune disease, and its early symptoms can be mistaken for stress, dieting or the ordinary erosion of a crowded life.

During the admission, clinicians measured how much insulin his body was producing and tested for antibodies associated with autoimmune diabetes. The results supported type 1. A hospital doctor put it plainly: “Your pancreas is producing very little insulin. This is type 1 diabetes, even though it began in adulthood.”

The sentence corrected the age-based assumption. It did not make the previous five months feel coherent.

Mark had lost 38 pounds because his body could not use glucose normally, not because he had finally become disciplined. The thirst, frequent urination, blurred vision and exhaustion belonged to the same process. Each symptom had been assigned a separate, plausible cause until the ER made separation impossible.

A different meaning for the belt

He stayed in the hospital for four days. Education began before the shock had settled: glucose checks, insulin, food, warning signs and the supplies he would need at home. The information was necessary, but necessity does not make it easy to absorb, especially when a person is still trying to understand how praise became evidence of illness.

His son visited once and asked whether the diabetes would go away when Mark gained the weight back. Mark said no. Later, he realized he had been waiting for an adult to tell him something different.

After discharge, the hospital bill and insurance notices arrived over the following six weeks. His share eventually came to $2,184. He arranged monthly payments with the billing office, but the amount was not the figure he returned to most. It was 38 pounds, visible in the extra length of belt extending past its loop.

At his first specialist appointment, Mark brought a page of questions and the glucose records he had been asked to keep. The specialist reviewed the hospital testing and repeated that adult-onset type 1 diabetes was not caused by his work schedule, divorce or inconsistent meals. Those things had helped him explain the symptoms. They had not created the disease.

That distinction relieved one form of blame while leaving another intact. Mark remained angry that severe weight loss could draw so much uncomplicated approval, including from people who watched him become tired and gaunt, yet he also knew he had accepted the same story because it matched something he had wanted for years.

Returning to work made the conflict visible. Coworkers who had praised him now lowered their voices to ask whether he was better. Mark said he was managing a permanent condition. He kept the explanation short, partly because the details were private and partly because there was no satisfying way to translate the previous months into workplace conversation.

One colleague apologized for complimenting the weight loss. Others said nothing.

Mark regained 12 pounds over the next five months. The change was medically expected, but it unsettled him. Weight had been treated as a public score for so long that gaining it back felt like failure even when his specialist described it as recovery from a period of profound insulin deficiency.

He stopped logging his weight every morning. The app remained on his phone.

The belt stayed in use, though he no longer fastened it through the hole he had made in March. On workdays, he packed lunch before leaving home and carried the supplies required for the condition that had been invisible while everyone was admiring its effects. Some days went smoothly. Others did not.

His son still asked whether he had everything before they left the house.

Questions people ask

Can type 1 diabetes really begin in adulthood?

Yes. Mark’s hospital team explained that autoimmune type 1 diabetes can develop at any age, even though many people still associate it with childhood. His age initially made type 2 seem more likely, but further hospital testing showed that his body was producing very little insulin and supported the adult-onset type 1 diagnosis.

Why can type 1 diabetes cause rapid weight loss?

In Mark’s case, clinicians explained that his body could not use glucose normally without enough insulin, so it began drawing on stored energy while sugar accumulated in his blood. The result was substantial weight loss despite periods of strong appetite, along with thirst, frequent urination, exhaustion and blurred vision.

Why did the weight loss look healthy to other people?

Mark had wanted to lose weight, worked long shifts and often skipped meals, so friends and coworkers had a ready explanation. Praise reinforced that interpretation even after the loss accelerated. The story showed how a culturally approved change can make accompanying symptoms easier to separate, minimize or assign to stress.

What was life like after the hospital?

Mark returned to work while learning the daily routines attached to a permanent condition and paying $2,184 in hospital costs over time. He regained some weight, stopped checking the scale each morning and kept using the same belt, fastening it through an older hole before work.