Bodybuilder Tristyn Lee has taken his physique transformation seriously. Over a year, the 21-year-old bulked up from 138 pounds(62.6 kilograms) to 175 pounds (80 kilograms). The most notable change he made was ditching his carnivore diet and adding in carbs, a decision he outlined in a video posted to Renaissance Periodization’s YouTube channel nine months ago (from when this article was posted). Lee posted a snapshot of the one-year mark of mass-gaining efforts below: View this post on Instagram A post shared by Tristyn Lee (@tristynleeofficial) Lee rose to social media fame years ago as a shredded teenager with soccer skills and a world-class work ethic. At age 13, Lee committed to the low-carb ketogenic regime for years until adopting a carnivore diet when he’d consume fewer than 10 grams of carbohydrates daily. However, eating mostly meat seemed to make building muscle mass challenging for Lee....