SEOUL, South Korea (AP) — North Korean leader Kim Jong Un has regained weight and appears to have obesity-related health problems such as high blood pressure and diabetes, and his officials are looking for new medicines abroad to treat them, South Korea’s spy agency told lawmakers on Monday.

The 40-year-old Kim, known for heavy drinking and smoking, comes from a family with a history of heart problems. Both his father and grandfather, who ruled North Korea before his 2011 inheritance of power, died of heart issues.

Some observers said Kim, who is about 170 centimeters (5 feet, 8 inches) tall and previously weighed 140 kilograms (308 pounds), appeared to have lost a large amount of weight in 2021, likely from changing his diet. But recent state media footage show he has regained the weight.

On Monday, the National Intelligence Service, South Korea’s main spy agency, told lawmakers in a closed-door briefing that Kim is estimated to weigh about 140 kilograms (308 pounds) again and belongs to a high-risk group for heart disease, according to Lee Seong Kweun, one of the lawmakers.

Lee said the NIS told lawmakers that Kim has shown symptoms of high blood pressure and diabetes since his early 30s. Another lawmaker, Park Sunwon, said the NIS believes Kim’s obesity is linked to his drinking, smoking and stress.

Lee and Park quoted the NIS as saying it obtained intelligence that North Korean officials have been trying to get new medicines abroad for Kim's suspected high blood pressure and diabetes.

North Korea is one of the most secretive countries in the world, and there is virtually no way for outsiders to know Kim's exact health conditions. The NIS also has a spotty record in confirming developments in North Korea.

Kim's health is the focus of keen attention outside North Korea since he hasn't formally anointed a successor who would take charge of the country's advancing nuclear arsenal targeting the United States and its allies if he was incapacitated.

The NIS in its Monday briefing also maintained its assessment that Kim's preteen daughter, reportedly named Kim Ju Ae, is likely bolstering her status as her father's heir apparent. But the NIS said it cannot rule out the possibility that she could be replaced by one of her siblings because she hasn't been officially designated as her father's successor.

Speculation about Kim Ju Ae, who is about 10 years old, flared as she has accompanied her father on high-profile public events starting in late 2022. State media called her Kim Jong Un's “most beloved” or “respected” child and churned out footage and photos proving her rising political standing and closeness with her father.

The NIS told lawmakers that at least 60% of Kim Ju Ae's public activities have involved attending military events with her father.