The shirt of the 26-year-old UNC graduate student reads, "El paciente no es apto para la practica del alpinismo," which translates to, "The patient is not fit for the practice of mountaineering."
Ackerman laughs as he explains that the quote is the "ironic inspiration" for his upcoming journey.
Ackerman, a diabetic, is a founding member of International Diabetic Expedition to Aconcagua 2000, a group of diabetics that at the end of the month will scale the tallest peak in the western hemisphere, the 22,834-foot Cerro Aconcagua in Argentina.
The shirt's quote, taken from the medical chart of a fellow diabetic, only fuels Ackerman's desire to prove to the world that diabetics are just as capable as everyone else.
"It's great to have a group of diabetics visibly trying to do something they were told they can't do," he said.
Ackerman and the 40-member group hope to inspire all diabetics through extreme athletic activity.
IDEA2000 also aspires to raise money to help fund medical research for diabetes and provide medicines to those who cannot afford it.
The organization is being sponsored for the climb, through which it hopes to raise $2,000,000 to benefit Latin American diabetes charity groups. Ackerman has already raised nearly $2,000 through his personal efforts.
"This will have a major impact, and I hope (the groups) can expand their current services," he said.