The world’s fattest man may have been done in by his love for energy drinks, his doctor said Tuesday.

Andres Moreno, who weighed 980 pounds at his heaviest, suffered a fatal heart attack on Christmas Day just two months after undergoing stomach bypass surgery, according to the Daily Mirror.

After going under the knife, the 38-year-old Mexican got addicted to energy drinks — guzzling more than six a day before his death, according to Dr. Jorge Ojeda.

“As an obese man, although he was losing weight and was starting to move, exposing yourself to a stimulant can cause an irregular heartbeat, and that or a heart attack can lead to death,” said Ojeda. “He drank more than six energy drinks a day according to his family and we believe it could be a lot more than six.”

The medical group that organized Moreno’s stomach surgery in October, Gastric Bypass Mexico, told the Daily Mirror that his consumption of energy drinks was equivalent to a person with no health problems drinking 42 cans of Coca-Cola in 72 hours.

The diabetic first began putting back the caffeine-filled beverages following a fight with his wife, according to local media reports.

Moreno weighed around 700 pounds when he died in his home town of Ciudad Obregón in Sonora, Mexico, according to the Daily Mail.

He was 13 pounds at birth and was already tipping the scales at 264 pounds by the age of 10.