Fitness influencer dies mid-experiment after consuming 10,000 calories a day for a before-and-after ‘challenge’ todayheadline

A Russian fitness influencer, Dmitry Nuyanzin, who tried to prove a dramatic “gain-and-lose” weight experiment has died in his sleep after consuming massive amounts of junk food for weeks. Dmitry Nuyanzin, 30, from Orenburg, had been eating more than 10,000 calories a day as part of a challenge he believed would inspire his clients. According to People, his heart failed overnight, just a day after he cancelled training sessions and told friends he was unwell and planned to see a doctor.

A challenge that took a fatal turn

Nuyanzin had set out on a mission: rapidly gain at least 25 kg and then shed it publicly to motivate others on their own fitness journeys. His so-called “marathon” involved stuffing himself with fast food daily, documenting the process online, and promising a big transformation later.

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In his last Instagram post on November 18, he appeared with a packet of Lays and wrote that he now weighed 105 kg—up 13 kg in a month. He had hoped this extreme phase would convince people to follow his weight-loss programme.

The People report says Nuyanzin’s heart stopped while he slept.

‘Shocking news,’ say followers

As news of his death spread, social media users posted tributes, and warnings.“It is better to prove such theories not in practice. Rest in peace,” one person wrote.
Another said: “It’s true. If you’re not used to junky fries fast food it will indeed make you sick!”
A third added: “Well, if ever there was a cautionary tale, then this has to be it.”
A fourth mourned him as “An excellent coach and a wonderful mentor, and just a good person. The news was shocking. Condolences to the family.”

Inside his extreme daily diet

Nuyanzin’s eating routine was as heavy as it sounded. He openly described his meals:

“For breakfast, I have a plate of pastries and half a cake. For lunch, I usually eat 800 grams [nearly 2 lbs.] of dumplings with mayonnaise,” he’d said. “During the day, I may snack on crisps, and for dinner, I have a burger and two small pizzas, either at a cafe or delivered.”

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These oversized meals added up to more than 10,000 calories a day—several times the recommended intake.

A decade-long career cut short

Nuyanzin wasn’t new to the fitness world. He had graduated from the Orenburg Olympic Reserve School and the National Fitness University in St Petersburg. For ten years, he trained elite Russians and built a loyal following online.

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His sudden death is now sparking conversations about extreme fitness challenges, the pressure to create viral content, and the growing culture of risky online stunts.