Meet Dr. Rosa Keller — Gut Microbiome Nutrition Scientist & Performance Dietitian
Dr. Rosa Keller is a UCSF- and Oregon State University-trained nutrition scientist and registered dietitian specializing in gut microbiome health, metabolic health, and personalized nutrition.
Through evidence-based nutrition strategies, she helps individuals understand how food influences gut bacteria, inflammation, blood sugar regulation, energy, mood, and overall healthspan.
Her approach combines nutrition science, microbiome research, and practical food strategies to create sustainable improvements in health.
How Dr. Rosa Keller Helps You Improve Gut Microbiome Health Through Personalized Nutrition
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Personalized Nutrition for Gut & Metabolic Health
I offer personalized nutrition counseling and gut microbiome testing to help you understand your unique health needs and develop evidence-based strategies for improving digestion, energy, metabolic health, and overall wellbeing.
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The Science Behind Food, Your Microbiome & Your Health
Learn how nutrition influences gut bacteria, inflammation, blood sugar regulation, and long-term health.
Gut microbiome diversity
Fiber and prebiotics
Gut-brain connection
Plant compounds and polyphenols
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Dr. Rosa Keller provides Gut health, metabolic health, and performance nutrition across multiple locations. We proudly serve clients in:
Costa Mesa, Anaheim, Yorba Linda, Orange, Tustin, San Francisco and across Orange County
Whether you’re seeking gut health, sport & fitness, or cardiometabolic nutrition, we bring science-backed guidance to your city.
Understanding the Science Behind Your Health
Your gut microbiome plays a powerful role in digestion, immune function, metabolism, inflammation, and overall wellbeing.
Dr. Rosa translates the latest nutrition research into practical strategies focused on:
Gut microbiome diversity
Gut-brain connection
Fiber & prebiotics
Polyphenol-rich foods
Blood sugar regulation
Metabolic health
Science-Backed Nutrition Insights
Gut Health Guide
Discover the essentials of gut health and learn how to support your microbiome for energy, mood, and overall wellness.
Read Article
Metabolic Health and Nutrition: Why Consistency Matters.
Discover how consistent nutrition habits support metabolic health, stabilize blood sugar, improve energy, and promote long-term wellness.
Read Article
Learn how fermented foods support gut microbiome diversity, digestion, and overall health by providing beneficial bacteria and important nutrients.
Read Article
Fermented Foods for a Gut Health
Frequently Asked Questions
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A gut health dietitian specializes in improving digestion, gut microbiome balance, and overall wellness through personalized, whole-food nutrition strategies. They guide clients on diet, supplements, and lifestyle changes to optimize gut health.
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A healthy gut supports digestion, immunity, metabolism, and mental well-being. Maintaining gut balance can reduce inflammation, enhance energy, and contribute to a longer, healthier life.
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Gut microbiome testing analyzes the bacteria in your digestive system to identify imbalances. This helps create personalized nutrition plans to improve digestion, immunity, and overall health.
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Yes! Tailored nutrition based on individual gut health can boost energy, optimize nutrient absorption, reduce digestive issues, and enhance exercise performance for better overall results.
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Gut microbiome diversity can be supported by eating a wide variety of plant-based foods, increasing fiber intake, including prebiotic and fermented foods, and maintaining healthy lifestyle habits. A diverse diet provides different nutrients that help support beneficial gut bacteria.
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Fiber and prebiotics act as fuel for beneficial gut bacteria. When gut microbes break down these compounds, they produce beneficial substances such as short-chain fatty acids that support digestive health, inflammation regulation, and metabolic function.escription
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Yes. The gut microbiome interacts with metabolism, nutrient processing, and inflammation pathways that influence blood sugar regulation. A balanced nutrition approach that includes fiber-rich foods, adequate protein, and personalized dietary strategies can help support metabolic health.
What clients are saying:
Matt M.
“Rosa is the absolute best! She got very specific to help me get on track for my nutritional and fitness goals. She provided gave me guidance on the right types of food I should be eating. In my case, I was most concerned with protein intake. We worked to find high protein but low calorie options. From there, Rosa worked with me on EXACTLY how many grams I should be consuming per day. We worked to plan my meals around this number. She also recommended tasty options that were in line with my nutritional goals. In addition to that, she recommended WHEN I consume my meals to help me most effectively reach my goals. She even recommended a supplement I take that has worked extremely well for me!”
Lisa S.
“Dr. Keller’s extensive knowledge of nutrition science is truly impressive. She empowers you to take control of your health. She is warm and friendly and creates a comfortable and open space for discussion. Instead of pushing a one-size-fits-all plan, Rosa takes the time to understand individual needs and preferences. She focuses on building sustainable healthy habits rather than quick fixes or restrictive diets. I highly recommend Rosa to anyone seeking a knowledgeable, supportive, and compassionate partner.”
Mari F.
“Working with Dr. Keller over the past several months has been transformative in managing my nutrition and weight. Her patience, attentiveness, and unwavering dedication to my progress, both for short- and long-term goals, are truly unmatched. I feel so grateful to have connected with Fay and to be working with Dr. Keller. If you’re looking to change your perspective on food, health, and wellness for the better, I highly recommend her!”