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.