Functional GI Doctor
Locations in Naples and Tampa, Florida

Medically reviewed by Dr. Robert Rubin, MD. Last reviewed August 2026.

What is Functional GI?

At Improving Your Health, Dr. Rubin practices functional medicine, with a particular focus on Functional Gastrointestinal Disorders, addressing gut issues at the root level.

Beginning with a thorough medical history that reviews your GI symptoms and your diet, Dr. Rubin uses advanced functional GI testing to reach a comprehensive analysis of your gut health, looking for:

• Food allergies
• Sensitivity to lectins, gluten, or dairy
• Toxin overload
• Imbalance in gut bacteria
• Yeast overgrowth
• Inflammation and system inflammatory symptoms like fatigue, brain fog, and joint pain
• parasites
• autoimmune disease

An expert in conditions like SIBO and IBS, as well as common symptoms like constipation/diarrhea, bloating, and heartburn. Dr. Rubin understands that a healthy gut microbiome is essential to a healthy digestive tract.

If you are interested in a Functional GI consultation, call either of our offices or book online today:

• Naples Office: (239) 977-9220
• Tampa Office: (813) 499-1440