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Liz Greenfield, MS, RN, IFMCP
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Elizabeth Greenfield — a San Francisco Bay Area clinician specializing in personalized, lab-driven hormone and gut health care for midlife women, differentiated by use of functional testing and DNA me
A woman comes to me bloated by noon, every single day, for two years.
She has already done everything conventional medicine asks. Scopes. Biopsies. Full blood panels. Every result comes back clean. And she is still unbuttoning her waistband by lunch, being told there is nothing wrong.
Here is what I know clinically: those workups were never designed to answer her question.
Scopes, biopsies, and standard blood tests are built to look for structural disease and frank pathology — ulcers, inflammation, celiac markers, tumors. They are very good at what they do. What they cannot do is evaluate the microbiome, the trillions of bacteria and yeast whose balance determines how she actually digests, ferments, and feels after a meal. That is not a criticism of those tests. It is a description of what they were built to see, and what they were not.
Two of the most common drivers of relentless daily bloating live precisely in that blind spot:
SIBO — small intestinal bacterial overgrowth, where bacteria that belong further down the digestive tract colonize the small intestine and ferment food into gas within an hour of eating.
Candida overgrowth — an overgrowth of yeast that disrupts the gut environment and produces its own cascade of bloating, cravings, and fog.
Neither will show up on a scope. Neither will show up on a biopsy or a standard blood panel. A woman can be structurally healthy and still be miserable by noon.
This is where the right data changes everything. A SIBO breath test measures the gas produced by bacterial fermentation in the small intestine. An organic acids panel reads the metabolic byproducts of bacterial and fungal overgrowth. A GI-MAP maps the actual organisms living in the gut. Together they capture what conventional workups structurally cannot — and they turn "everything looks fine" into a specific, legible picture.
Because without that picture, treatment is a guess. You cannot resolve an overgrowth you have not identified, and you cannot restore balance you have never measured. With it, the path is clear: name the root cause, correct the imbalance, and resolve the symptom — not manage it indefinitely, not learn to live with it. Resolve it.
The woman in this scenario was never broken, and she was never unlucky. She was given incomplete information. That is a solvable problem.
This is the work I do in my practice — finding what the standard panels were never built to find.
If you have been told your gut looks normal but your body keeps telling you otherwise, book a discovery call and let's find out what is actually driving it: https://lizgreenfield.kartra.com/calendar/book-with-liz