Blake Shelton’s recent online concert had fans noticing a significant change in his appearance. The  country star has experienced a health scare that resulted in noticeable physical changes, and these shifts aren’t just about his image.

Blake has been gaining weight to the point that his wife, Gwen Stefani, has suggested he go to a “fat farm” to address his overeating habits and his fondness for high-calorie foods like country fried steak, mashed potatoes, and Velveeta dip.

“His weight yo-yos up and down, he’ll lose weight and then go right back to his bad habits and pile it all on again,” a source exclusively tells Life & Style. “Everyone agrees something needs to change for the sake of his health.”

In January, the 48-year-old, who stands at 6-foot-5, showed off a slimmer figure on CMT Giants. However, leaving The Voice last year has left him with more free time, which, according to the insider, has negatively impacted his eating habits.

In the last eight months, Blake has gained more than 30 pounds, bringing his weight to 250 pounds, which the source says is far from healthy. “He admits he needs to lose at least 20 pounds, but he can’t seem to stick to a healthy diet no matter how hard he tries. He’s going hog wild on barbecue pork sandwiches with all the fixings and all his other favorite foods. Gwen’s obsessed with her diet and she’s worried he’s on his way to being obese. Clearly, his body-fat ratio is less than ideal. She’s convinced Blake will feel better if he loses 20 pounds.”

Gwen, 55, has returned to The Voice this season, so she doesn’t have the time to keep an eye on Blake’s eating habits. “She can’t watch him every second, which makes a weight loss facility even more appealing,” the source reveals. “He can get professional help, exercise and understand why he’s reaching for the potato chips and beer, and get his weight back down to a healthier place.”