Ali Foley Shenk still remembers the panic when her 10-year-old son, Dean, finished a 20-ounce box of raisins in the seconds the cupboard was left unlocked. They rushed to the emergency room, fearing a dangerous bowel impaction.
The irony stung: When Dean was born, he was so weak and floppy he survived only with feeding tubes because he couldn’t suck or swallow. He was diagnosed as a baby with Prader-Willi syndrome — a rare disorder sparked by a genetic abnormality. He continued to be disinterested in food for years. But doctors warned that as Dean grew, his hunger would eventually become so uncontrollable he could gain dangerous amounts of weight and even eat until his stomach ruptured.
“It’s crazy,” said Foley Shenk, who lives in Richmond, Virginia. “All of a sudden, they flip.”
Prader-Willi syndrome affects up to 20,000 people in the U.S. The most striking symptom is its most life-threatening: an insatiable hunger known as hyperphagia that prompts caregivers to padlock cupboards and fridges, chain garbage cans, and install cameras. Until recently, the only treatment was growth hormone therapy to help patients stay leaner and grow taller, but it didn’t address appetite.
In March, the Food and Drug Administration approved Vykat XR, an extended-release version of the existing drug diazoxide choline, which eases the relentless hunger and may offer insights into the biology of extreme appetite and binge eating. This breakthrough for these patients comes as other drugs are revolutionizing how doctors treat obesity, which affects more than 40% of American adults. GLP-1 agonist medications Ozempic, Wegovy, and others also are delivering dramatic results for millions.
But what’s becoming clear is that obesity isn’t one disease — it’s many, said Jack Yanovski, a senior obesity researcher at the National Institutes of Health, who co-authored some of the Vykat XR studies. Researchers are learning that obesity’s drivers can be environmental, familial, or genetic. “It only makes sense that it’s complex to treat,” Yanovski said.
Obesity medicine is likely heading the way of treatments for high blood pressure or diabetes, with three to five effective options for different types of patients. For example, up to 15% of patients in the GLP-1 trials didn’t respond to those drugs, and at least one study found the medications didn’t significantly help Prader-Willi patients.
Yet, researchers say, efforts to understand how to treat obesity’s many causes and…
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