A BODYBUILDER has told how his "dirty" diet left him overweight and unrecognizable.

Jeff Seid, 28, warned fitness fans to avoid stuffing their faces with junk food in the hopes of bulking up their physique fast.

Jeff Seid was crowned the youngest American IFBB Pro bodybuilder in history at age 19

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Jeff Seid was crowned the youngest American IFBB Pro bodybuilder in history at age 19Credit: Getty
The fitfluencer warned gymgoers not to dirty bulk as it left him unrecognisable

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The fitfluencer warned gymgoers not to dirty bulk as it left him unrecognisableCredit: Instagram/Jeff Seid
The 28-year-old said his get big quick scheme impacted his health and self esteem

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The 28-year-old said his get big quick scheme impacted his health and self esteemCredit: Instagram/Jeff Seid

Despite his notoriety as one of America's most successful bodybuilders, Jeff admitted he struggled to maintain his muscles.

He first shot to fame after being crowned the youngest American IFBB Pro bodybuilder in history at the age of 19.

The three-time Mr Olympia contestant began strength training in his early teens before ditching his promising passion for soccer in exchange for the gym.

Jeff's popularity went on to earn him a string of modeling gigs as well as fame in the fitness world, seeing him rack up 4.4million Instagram followers.

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While sharing his workout plans with fans, the 28-year-old also offers a brutally honest perspective of the reality of life as a muscleman.

The bodybuilder explained that his weight had spiraled out of control after he embarked on a six-month transformation diet.

Despite not competing for a number of years, Jeff still feels the pressure to keep up his brawny appearance.

The fitfluencer confessed his latest bulking diet did not go to plan and left him ashamed to post pictures after he gained 40 pounds.

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Discussing his excessive eating habits on Instagram, the model revealed he had become "unhealthy" - and paid the price.

Jeff, from Renton, Washington, said in the clip: " I got fat and the reason why I got fat is because I dirty bulked.

"Now, a dirty bulk is when you eat everything in sight to put on as much size and weight as possible.

"But there is one dilemma, I put on a lot of fat. I bulked for six months."

The bodybuilding legend said he ate "pretty clean" for the first four months and was "very strict" with his diet.

Jeff then gradually began increasing the number of calories he consumed as he was growing larger, thinking he was gaining more muscle than fat.

He eventually built up to chowing down 5,000 calories each day - double the recommended daily intake for men.

But as he moved into the final two months of his bulking mission, he became obsessed with seeing the number on his scales climb higher.

The 28-year-old continued: "So, I decided let’s f***ing eat everything. Let’s get huge. It’s time to dirty bulk baby. I stopped doing cardio and started eating everything.

Don’t just focus on the scale and weight. Look in the mirror.

Jeff Seid

"I put on size. I got up to 232-pounds, so I actually gained 40-pounds from the beginning of my bulk till the end of my bulk.

"It was actually a lot of size to gain in six months. It’s about 6.6-pounds a month. I’ll be honest with myself, I know it wasn’t a lot of muscle I gained, it was a lot of fat."

Social media users were left shocked when Jeff began flaunting his large figure online that drastically differed from his usual toned bod.

The model soon realised his plan to get big quick had backfired - and was even affecting his health.

He said: "The reason why I had to stop the bulk and the number one reason why the dirty bulk isn’t good is because it’s unhealthy.

"What happened to me personally is my blood pressure went through the roof."

Jeff explained he had to "shred extra hard" to lose his excess weight, which diminished the majority of the newly built muscle he had gained.

He now wants to warn other gymgoers against dirty bulking and reminded people to "responsibly" pursue their fitness goals.

The bodybuilder advised his followers to eat fairly clean while gradually increasing your calories while getting good rest to allow your body to recover.

He added: "Don’t just focus on the scale and weight. Look in the mirror. See how much fat you’re gaining.

"If you’re gaining too much fat and not enough muscle, it might be time for you to start shredding and end the bulk.

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Read More on The US Sun

"Would I recommend dirty bulking to you? No, I wouldn’t."

Jeff has since shared a string of snaps showing off his usual hulking physique after refocusing his fitness plan.

Jeff boasts a whopping 4.4million Instagram followers

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Jeff boasts a whopping 4.4million Instagram followersCredit: Instagram/Jeff Seid
Fans were left shocked when he swapped his usual toned physique for a much larger frame

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Fans were left shocked when he swapped his usual toned physique for a much larger frameCredit: Instagram/Jeff Seid
Jeff advised fitness lovers to pursue their goals responsibly

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Jeff advised fitness lovers to pursue their goals responsiblyCredit: AFP