On One Condition Podcast By Sylvain Berthelot cover art

On One Condition

On One Condition

By: Sylvain Berthelot
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On One Condition is a podcast for anyone who wants to learn about a specific health condition. Hear from people who live with a condition, how it affects them and how they manage it. Sylvain Berthelot has worked in the clinical trial industry for over a decade. He is naturally curious and passionate about how the body functions. Through his interviews, he aims to give fellow human beings a voice, spreading the word about the multitude of medical conditions that affect us.

Hygiene & Healthy Living Physical Illness & Disease
Episodes
  • Episode 84: Sierra Domb - Visual Snow Syndrome
    Apr 15 2026

    When Sierra was diagnosed with Visual Snow Syndrome (VSS), little was known about this condition, and it was extremely difficult for her to get a diagnosis. By founding the Visual Snow Initiative, Sierra moved mountains to increase awareness and help bring recognition, research, and support to millions worldwide.

    VSS is a neurological condition that affects how the brain processes visual and sensory information. Sierra describes the sudden and terrifying onset of her symptoms at 21, when her vision changed permanently in an instant. She speaks candidly about the relentless nature of her condition—constant visual disturbances, sensory overload, and insomnia—and how these symptoms disrupted every aspect of her life. Yet, beyond the physical impact, it is the emotional toll of being dismissed, misdiagnosed, and left without answers that stands out most.

    What begins as a conversation about an often-overlooked condition quickly unfolds into a powerful story of resilience, medical trauma, and advocacy. Sierra’s journey reflects a broader issue within healthcare: the difficulty patients face when their condition doesn’t fit established frameworks.

    Throughout the episode, Sierra offers a compassionate and honest perspective on living with chronic illness. She reminds us that resilience is often not a choice, but something we are forced to build, and that even small victories matter. Her story is both heartbreaking and inspiring, shining a light on the unseen struggles many people carry and the quiet strength it takes to keep going.

    The song Sierra chose is Legend by Chronixx.

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    53 mins
  • Episode 83: Alexa Colella - LGMD2C
    Apr 1 2026

    Alexa’s daughter, Charlotte, lives with limb-girdle muscular dystrophy 2C (LGMD2C), a rare genetic disorder leading to childhood-onset progressive muscle weakness. In this discussion, Alexa takes us on a journey from an unexpected diagnosis at just two years old, to finding hope through groundbreaking gene therapy.

    What stands out is the way Alexa describes living with the condition not as a single moment of impact, but as something that unfolds over time—something she is “still reacting to almost 10 years later.” The conversation gently explores the realities of parenting a child with a rare disease: the constant planning, the invisible challenges, and the emotional complexity of watching your child grow up faster than they should have to.

    Charlotte’s story is not only one of medical complexity, but also of resilience, empathy, and perspective. From advocating for herself at school to comforting a nervous nurse at just four years old, she embodies a maturity shaped by lived experience. The episode also highlights the power of community and science, particularly the life-changing impact of gene therapy and the families who push boundaries to make treatments accessible.

    Above all, this episode is about hope: hope found in progress, in people, and in the extraordinary spirit of a young girl who feels “weightless” in the ocean; a place where her condition momentarily disappears.

    The song that Alexa chose is Hallelujah by Jeff Buckley.

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    34 mins
  • Episode 82: Kelly Berger & Avery Roberts - Collagen 6
    Mar 18 2026

    Kelly and Avery are two advocates living with Collagen VI-related congenital muscular dystrophy (CMD), an ultra-rare neuromuscular condition that causes progressive muscle weakness and impacts mobility and respiratory function.

    They share their personal journeys with disability, discussing how their condition shaped their childhood, their transition to using power wheelchairs, and the societal assumptions they have had to challenge along the way. What emerges is not a story defined by limitations, but one of determination and community.

    Beyond their personal experiences, both guests highlight the importance of advocacy – from mentoring younger people with CMD to participating in Rare Disease Week on Capitol Hill to raise awareness and influence policy. Their reflections underscore the urgency of improving diagnosis timelines, increasing research access, and ensuring people with disabilities are included in decisions that affect them.

    Kelly and Avery host their own podcast, Wheel Talks, which provides a space for honest conversations about disability, independence, and representation. Their voices bring warmth, honesty, and hope about living fully while navigating a rare condition.

    Ultimately, this episode is a powerful reminder that visibility, storytelling, and community can create meaningful change.

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    39 mins
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