Chris Bumstead on Diary of a CEO: Depression, Autoimmune Disease & The Real Cost of Being the World's Best Bodybuilder

CBum's most honest conversation ever — what winning 5 Mr. Olympia titles actually does to your mind, body, and relationships

Chris Bumstead — known universally as CBum — is the most popular bodybuilder on the planet. With 5 consecutive Classic Physique Mr. Olympia titles and over 30 million social media followers, he's the face of modern fitness culture. But his Diary of a CEO episode with Steven Bartlett reveals a person far more complex, vulnerable, and thoughtful than the physique photos suggest.

This isn't a training tips episode. This is a deeply personal conversation about depression, chronic illness, identity, steroid use, and what happens when you achieve everything you ever wanted and still feel empty. It's one of the most powerful mental health conversations the show has produced.

The Autoimmune Disease Nobody Talks About

Early in the conversation, Bumstead reveals something that shocks many viewers: he has IgA nephropathy, a serious autoimmune kidney disease. He was diagnosed at 19, right as his bodybuilding career was taking off. Doctors told him his kidneys could fail. The career he was building — one that requires pushing the body to absolute extremes — was medically reckless.

He chose to compete anyway.

"I knew it could shorten my life. I knew it was a risk. But I'd rather live a shorter life doing what I love than a long life wondering what could have been. That's a choice I made with open eyes."

Bartlett presses him on this, asking whether it's courage or recklessness. Bumstead's answer is nuanced: "Probably both. I think they live closer together than people want to admit." He monitors his kidney function regularly and has adjusted his approach over the years, but he's transparent that competitive bodybuilding at the highest level is inherently unhealthy — and that anyone who claims otherwise is lying.

Depression Behind the Physique

Perhaps the most impactful segment of the episode is Bumstead's discussion of his mental health struggles. Here is a man with what millions of people consider the "perfect" body, unlimited social media validation, and competitive dominance — and he has battled serious depression.

He tells Bartlett about periods where he couldn't get out of bed. Where he'd look in the mirror — the same mirror that reflected a body millions admired — and feel nothing but emptiness. Where the cycle of contest prep, peaking, winning, and then crashing into post-competition depression became its own form of torture.

"Winning fixes nothing," he tells Bartlett. "The first Olympia, I thought it would change everything. It changed nothing inside. The second one, same. By the third, I understood: no trophy is going to fill whatever hole is inside you. You have to do that work separately."

This echoes themes from the Mo Gawdat happiness equation episode — the idea that external achievements can never satisfy internal needs.

Steroid Use: The Honest Conversation

Bumstead is remarkably open about performance-enhancing drug use in bodybuilding, a topic most athletes dodge entirely. While he doesn't detail specific compounds or dosages, he acknowledges the reality plainly: competitive bodybuilding at the Olympia level requires pharmacological enhancement. Every competitor uses. Pretending otherwise is dishonest.

What's more interesting is his discussion of the psychological effects. He describes mood swings, aggression, emotional volatility, and the difficulty of knowing which version of yourself is "real" when your hormones are constantly being manipulated. "There are days I don't know if I'm feeling something because of who I am or because of what I'm taking. That's a strange way to live."

He's careful to say he's not recommending this path to anyone. His message to young men watching: "Get as far as you can naturally first. Most people never even come close to their natural potential. And the costs of this lifestyle — physical, mental, relational — are way higher than Instagram makes them look."

Identity Crisis: Who Are You Without the Title?

Bartlett asks what might be the most important question of the episode: "Who is Chris Bumstead without bodybuilding?"

The pause before Bumstead answers says everything. He admits he's been working on this — in therapy, in his relationship with his partner Courtney, in his role as a father. But for years, his entire identity was fused to being Mr. Olympia. Every decision, every relationship, every daily routine revolved around the next competition.

"I attached my entire self-worth to this sport. When I won, I was somebody. When the off-season came, I didn't know who I was. That's a dangerous place to live, and I wouldn't wish it on anyone."

He credits his relationship and becoming a father with beginning to shift this. Having someone who loves him regardless of whether he wins or loses — who doesn't care about his physique — has been genuinely healing. "Courtney doesn't care about Mr. Olympia. She cares about whether I'm present, whether I'm kind, whether I'm a good partner. That grounds me."

Lessons for Men's Mental Health

What makes this episode particularly significant is its audience. CBum's fanbase is overwhelmingly young men — exactly the demographic least likely to discuss mental health openly. Hearing someone they idolise speak candidly about depression, therapy, and vulnerability likely does more good than a thousand public health campaigns.

Bumstead's key messages for men:

• Toughness and vulnerability aren't opposites. It takes more strength to admit you're struggling than to pretend you're fine.
• Therapy isn't weakness. "I resisted it for years. It's the best decision I ever made, and I wish I'd started earlier."
• Your body is not your worth. Whether you're the best in the world or a beginner, your value as a human doesn't come from how you look.
• Success amplifies problems. If you're broken inside, winning just gives you more resources to avoid dealing with it.
• Find identity outside your craft. You need to be more than your job, your sport, or your following.

For more on this theme, see our roundup of the best Diary of a CEO mental health episodes.

Key Takeaways From the Episode

1. Winning doesn't fix you. External achievements can't solve internal struggles. Do the inner work.
2. Chronic illness doesn't have to stop you — but be honest about the trade-offs you're making.
3. The "perfect body" doesn't equal happiness. Bumstead is living proof that physical perfection and mental suffering can coexist.
4. Men need to talk about mental health. Silence isn't strength. It's slow destruction.
5. Identity should be broader than one thing. If you lose your title, your job, or your physique — who are you?
6. Relationships ground you. Find people who love you for who you are, not what you achieve.