Karen Sumner, RD, works at the intersection of nutrition counseling and medication-supported weight management, with particular attention to the questions that arise when progress on tirzepatide begins to slow. Her practice speaks to a common and often frustrating experience: using Zepbound or tirzepatide for weight loss, only to find that results no longer match expectations. Rather than treating that slowdown as a mystery, the focus is on understanding the science behind the medication and identifying practical factors that can influence outcomes.
That includes the everyday details that shape success over time—dietary patterns, dosage timing, and the broader habits that affect how a weight-loss plan performs in real life. The work is grounded in helping clients make sense of why tirzepatide may not be working as hoped and what thoughtful adjustments may help get progress back on track. It is a measured, educational approach that favors clarity over hype and practical guidance over one-size-fits-all advice.
Accessibility is also part of the model. Through Fay, nutrition care is connected to insurance coverage, making registered dietitian support easier to access and more affordable. Within that framework, the emphasis remains on informed, expert nutrition guidance for people navigating weight-loss treatment and looking for a clearer path forward.
Karen Sumner’s profile is that of a dietitian focused on helping clients better understand medication-assisted weight loss, especially when tirzepatide raises as many questions as it answers. The work combines science, nutrition, and realistic next steps in a way that keeps the experience grounded and actionable.
Karen Sumner, RD
99 Hudson St
New York, NY 10013
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