Denver Broncos quarterback Jay Cutler recently announced that he has Type 1 diabetes and needs daily insulin injections.

ENGLEWOOD, Colo. — Jay Cutler realizes he should have recognized something was wrong last season when lost 35 pounds and some zip on his famous fastballs.

“I had no energy,” the Denver Broncos’ third-year quarterback said Friday. “We thought it might be stress and the grind of going through a whole season. But once I got back here and started working out again, I just wasn’t making any improvement. I wasn’t getting any stronger. I was still losing weight.”

Routine blood tests that are required before players participate in the team’s offseason strength and conditioning program revealed the answer: His sugars were about five times higher than normal.

The 25-year-old quarterback met with doctors last month, who told him he’s an insulin-dependent diabetic. He got a crash course in the disease and its ramifications if uncontrolled.

He said he never worried about his career being in jeopardy.

“No. That’s the first thing they said to me: ‘It’s going to affect your lifestyle a little bit, but you’ll be able to continue to play football,’” Cutler said. “I’m not the first athlete to get diabetes and I won’t be the last.”

Other professional athletes who dealt with diabetes and had successful careers include NFL quarterback Wade Wilson; tennis stars Arthur Ashe and Billie Jean King, Olympic swimmer Gary Hall Jr., NHL star Bobby Clarke, baseball Hall of Famer Ty Cobb and boxing greats Joe Frazier and Sugar Ray Robinson.

As long as Cutler manages his disease through exercise, medication and diet, there’s no medical reason he wouldn’t be able to continue performing at the NFL level. He’ll have to monitor his blood glucose levels during games and drink some Gatorade if his sugars drop too low or take a shot of insulin if they skyrocket.

About 21 million Americans have diabetes, meaning their bodies cannot properly turn blood sugar into energy.