Rep. Jesse Jackson Jr. is regaining his strength after undergoing treatment for bipolar disorder possibly tied to gastric bypass surgery, according to a blog post written today on the Mayo Clinic’s website.

In the most specific acknowledgement of Jackson’s condition yet, Mayo Clinic spokeswoman Traci Klein posted on the facility’s blog this afternoon, writing that the Illinois Democrat is doing well in treatment at the facility in Rochester, Minn.

“Following extensive evaluation, Congressman Jesse Jackson, Jr. is undergoing treatment for Bipolar II depression at Mayo Clinic in Rochester, Minn. Congressman Jackson is responding well to the treatment and regaining his strength,” she wrote. “Many Americans have bipolar disorder. Bipolar II disorder is a treatable condition that affects parts of the brain controlling emotion, thought and drive and is most likely caused by a complex set of genetic and environmental factors.”

Jackson underwent a gastric bypass surgery in 2004 and lost about 50 pounds.

“This type of surgery is increasingly common in the US and can change how the body absorbs food, liquids, vitamins, nutrients and medications,” Klein said.

Klein added that Jackson asked that the clinic produce an information brochure about the disorder on his behalf. A link to the brochure was published on the blog.

She noted that no time frame is expected for another update on Jackson’s condition.

Jackson started medical leave in June, although his office did not specify why.

After rampant speculation, his office finally divulged that he was being treated for a mood disorder, although the specific type has not been made public until now.