Nuyanzin spent weeks consuming junk food as part of a 'marathon' challenge he hoped would inspire his clients to shed weight alongside him. He consumed upwards of 10,000 calories a day and was planning to shed it all over to show his transformation, according to a report in People.
A day prior to his death, Nuyanzin cancelled training sessions, informing friends that he was feeling unwell and planned on seeing a doctor. According to the report, Nuyanzin's heart failed as he slept.
Nuyanzin's last Instagram post, dated November 18, showed him eating a pack of Lays whilst revealing that he now weighed 105 kg, having gained at least 13 kg in a month.
Reacting to Nuyanzin's death, social media users expressed their condolences to the family, whilst stating that his story was a lesson to others attempting similar challenges.
"It is better to prove such theories not in practice. Rest in peace," said one user, while another added: "It's true. If you're not used to junky fries fast food it will indeed make you sick!"
A third commented: "Well, if ever there was a cautionary tale, then this has to be it."
A fourth said: "An excellent coach and a wonderful mentor, and just a good person. The news was shocking. Condolences to the family."
His dramatic, high-calorie daily diet included pastries and cake for breakfast; dumplings smothered in mayonnaise for lunch; and a burger with two small pizzas for dinner.
"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."
A graduate of the Orenburg Olympic Reserve School and the National Fitness University in St Petersburg, Nuyanzin had worked as a personal coach to elite Russians for a decade.
