Nickelodeon Alum Simon Curtis' Body Transformation Shocks The Internet

Former Nickelodeon actor and singer Simon Curtis is opening up about his dramatic physical transformation after quietly dropping a significant amount of weight, and fans can’t get enough of his new look. Curtis, now 39, first shot to fame in Nickelodeon’s 2009 TV musical "Spectacular!" before launching a successful music career. He revealed his slimmed-down physique on Instagram this week. After previously carrying a large belly, fuller cheeks, and a softer chest, the performer now shows off a noticeably flatter stomach and a sculpted jawline he says has left him feeling reinvigorated.

“I feel like a brand new person,” Curtis captioned the post, sparking an outpouring of support from fans. “You are fitness goals,” one commenter gushed, while another added, “I know how hard you worked for it. So proud of you.”

Curtis, who has released three studio albums and has a fourth arriving next year, told the Daily Mail that consistent workouts at Equinox have played a major role in his success. But he also revealed that a lesser-known medical treatment gave him a major boost behind the scenes.

In addition to hitting the gym, Curtis has been using peptide therapy, a cutting-edge treatment he originally began for autoimmune issues, including vitiligo and Hashimoto’s thyroiditis. The surprising side effect? Weight loss.

Peptide therapy has become increasingly popular among people looking to support metabolism, muscle repair, and energy levels. Peptides are short chains of amino acids, tiny biological messengers that regulate important processes including growth, repair, and immune response. Some peptides are naturally produced by the body, while others are lab-made versions used to mimic or enhance those natural effects.

Certain peptides, like insulin and growth hormone, are long-established medications. Others are considered experimental, used off-label by medical professionals or compounding pharmacies. Because some peptides influence appetite, digestion, and metabolic function, they are often incorporated into GLP-1 medications like Ozempic and Wegovy, the same class of drugs that has exploded in popularity for weight management.

According to experts, peptide therapy is especially appealing to middle-aged men seeking to boost performance, reduce joint pain, increase energy, and build muscle as they age.

Dr. Rula Ali, NSW & ACT Deputy Chair of the Royal Australian College of General Practitioners, explained that peptides act as “little messengers in the body” that influence hormonal signalling and immune responses. “Some peptides have well-established roles in medicine,” she told Daily Mail, pointing to insulin and growth hormone. Others, such as BPC-157 and TB-500, popular in fitness circles, are used off-label and have not undergone full testing in humans.

She notes the surge in peptide use may be due in part to social media, influencers, and a growing cultural shift around men wanting to maintain youth, strength, and vitality. But Dr. Ali stresses caution. While some peptides offer real benefits, others come with risks, including hormonal imbalance, numbness, joint stiffness, changes in blood sugar, hunger spikes, and fatigue.

Her advice to anyone considering peptide therapy? Consult your primary doctor first, especially if you’re seeking anti-aging or fitness-related results.

Simon’s transformation didn’t just grab attention, but it sparked a wave of praise across his Instagram comments, with friends, fellow creators, and longtime fans cheering him on.

Dayna Kathan dropped a row of fire emojis in support, while creator Scotty Dynamo wrote, “Let’s goooo! Well done, Simon!” with a heart. Others echoed the encouragement, with one user dubbing him “The king of Equinox!!!!” Fans were equally stunned by his sculpted new look, with someone commenting simply, “Snatched,” and another follower sharing, “So proud of you. I can’t wait for your new album. Love you, Simon.”

As he continues to evolve, Curtis shows that lasting change is possible, so long as the path forward is guided by intention, hard work, and the right support system.