Vinny Guadagnino returned to the Jersey Shore franchise this year looking leaner than ever. He says owes his body-sculpting success to the popular Keto diet, which is an ultra low-carb/high-fat diet that puts the body in a state called ketosis. Vinny has been documenting his Keto journey on an Instagram account called “Keto Guido.” He’s lost 50 pounds since being on the diet.

Vinny in 2015:

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Did Vinny stay on the Keto Diet while filming Jersey Shore?

Vinny even managed to mostly stick with his pretty strict diet while filming Jersey Shore: Family Vacation. He says he was about 80% on the diet during the booze-fueled vacation. The second episode shows a pretty wasted Vinny picking all the meat and cheese off of the pepperoni pizza the cast ordered after a long night out, so he was pretty serious about sticking with it despite all the temptation all around him.

Can you drink alcohol on Keto?

Vinny may have stayed mostly Keto even while drinking, but is alcohol even allowed on the Keto diet? According to PerfectKeto.com, Alcohol does slow the ketosis process, but alcohol can be consumed on the diet. The less sugar the better, so people on Keto often stay away from wine, beer, and sweet cocktails and go for liquor with sugar-free mixers.

In a March 8th Instagram post, Vinny extolled the virtues of the Ketogenic Diet, crediting for as a “fountain of youth.”

“When I ate sugars and grains I was 50lbs heavier and looked 10 years older,” he wrote. “I look around and feel sad and angry for the majority of the population who are overweight and obese that have been taught to eat grains, use ‘healthy’ margarines and oils, drink diet soda with artificial sweeteners, and stay away from saturated fats. This is why I started this page. To take away the stigma that saturated animal fat clogs your arteries and instead teach people the truth: sugars and grains will cause diseases and obesity before anything else.”

I’ve discovered the fountain of youth . You ready for it?….Stop eating sugars and grains and instead 98% of the time eat real food like whole eggs, bacon, butter, fatty steaks, fatty fish and plants and exercise a few times a week. When I ate sugars and grains I was 50lbs heavier and looked 10 years older . I look around and feel sad and angry for the majority of the population who are overweight and obese that have been taught to eat grains, use “healthy” margarines and oils, drink diet soda with artificial sweeteners,and stay away from saturated fats. This is why i started this page. To take away the stigma that saturated animal fat clogs your arteries and instead teach people the truth: sugars and grains will cause diseases and obesity before anything else. I bet if our older friends and relatives who suffer from chronic disease stopped eating sugars and grains and started eating real foods , in many cases would drop off their medication ( and not to mention, lose a shit ton of weight NATURALLY) But instead they are taught to eat whatever they want and let the medicine keep the disease in check ?…. until the medicine won’t save you anymore .. I’m speaking generally because everyone’s food sensitivity is different , but in most cases this will be the truth. #ketoguido #keto #ketosis

A post shared by Vinny (@ketoguido) on Mar 8, 2018 at 8:22pm PST

What is ketosis?

According to the Mayo Clinic, Ketosis when the body burns fat for energy instead of sugar (glucose.) “It’s not clear what kind of possible long-term health risks a low-carb diet may pose because most research studies have lasted less than a year,” the Mayo Clinic states.

Of course, PerfectKeto.com has a much less cautionary take on ketosis. “Ketosis is the metabolic state of having ketones in the blood, typically above 0.5mmol/L” the site states. They also state that while modern people rarely enter a state of ketosis because there are so many carbohydrates available, “our ancestors likely had frequent periods of time when high carbohydrate food wasn’t immediately available. For this reason, our bodies are amazing at adapting to burning of ketones for fuel.”

Holy shit these tasted amazing and you need to try it as a meal. Sugar free smoked salmon rolls with avocado , cream cheese , and arugula on the inside ,with a drop of black truffle oil . #eatfat #ketoisfun #burnfatnotsugar #notsteamedchickenandbroccolidiet

A post shared by Vinny (@ketoguido) on Dec 22, 2017 at 3:15pm PST

Amelia Cunningham is a Starcasm writer and editor