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The Gastro Truth with Dr. Mel Ona

The Gastro Truth with Dr. Mel Ona

By: Mel Ona
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Board-certified gastroenterologist with graduate training in nutritional biochemistry. 10,000+ patients treated. Thousands of procedures performed.


On this Podcast, Dr. Mel Ona breaks down gut health, digestive symptoms, nutrition science, colon cancer prevention, and disease detection in plain language you can actually use.


No sponsors. No supplement sales. No hype.


Just evidence-based answers from a GI doctor who practices what he teaches.


Topics include: bloating, acid reflux, IBS, colonoscopy, gut microbiome, fiber, fatty liver disease, probiotics, and health optimization for busy professionals.


New episodes weekly.


Subscribe for gut health guidance you can trust.

© 2026 The Gastro Truth with Dr. Mel Ona
Episodes
  • 5 Digestive Symptoms You Should Never Ignore (See a Doctor Immediately)
    Apr 23 2026

    📌 Looking to get into a new diet or need a Gastroenterologist? Visit: www.drmelona.com

    Blood you dismissed. Weight dropping without explanation. Heartburn that won't quit no matter what you take.

    Bowel habits that shifted weeks ago and haven't gone back. And sometimes, no symptoms at all when the risk is already growing.

    In this video, I’m going to walk you through the five digestive warning signs that get people into serious trouble, and exactly what each one means for your health.

    ⏱️ TIMESTAMPS
    0:00 - 5 Digestive Warning Signs You Should Never Ignore
    1:19 - Warning Sign 1: Blood in Stool or Rectal Bleeding
    3:30 - Warning Sign 2: Unexplained Weight Loss
    5:48 - Warning Sign 3: Persistent Heartburn or Difficulty Swallowing
    8:02 - Warning Sign 4: Persistent Changes in Bowel Habits
    10:37 - Warning Sign 5: No Symptoms and Overdue for Colonoscopy Screening
    11:41 - A Patient Who Waited: The Real Cost of Skipping a Colonoscopy
    13:15 - What to Do Tonight If You Are Overdue for Screening


    ❓ QUESTIONS ANSWERED

    Q: Is blood in stool always a sign of cancer?

    A: No. Hemorrhoids are the most common cause of rectal bleeding and will look identical to bleeding from a polyp or colorectal cancer. You cannot self-diagnose based on appearance, color, or amount. A proper evaluation by a gastroenterologist is the only way to confirm the source and rule out something more serious.


    Q: When should changes in bowel habits prompt a doctor visit?

    A: If your bowel habits have been consistently different from your baseline, including looser stools, new constipation, or alternating between the two, for more than 3 to 4 weeks without a clear cause, it warrants a medical evaluation.


    Q: At what age should you get a colonoscopy?

    A: Current guidelines recommend colorectal cancer screening starting at age 45 for average-risk individuals. If a parent, sibling, or first-degree relative has had colon cancer or polyps, you likely need to begin screening earlier.


    📱 RESOURCES
    Website: www.drmelona.com
    Books By Dr Mel Ona: https://drmelona.com/media/
    Patient Resources: https://drmelona.com/patient-portal/
    Instagram: https://www.instagram.com/drmelonagi

    Unsedated Colonoscopy Video: https://www.youtube.com/watch?v=-Vz1lXF0rmo

    🔔 Subscribe for evidence-based digestive health, nutrition science, and disease prevention from a board-certified gastroenterologist.


    ABOUT DR. MEL ONA:

    I'm Dr. Mel Ona, a board-certified gastroenterologist with graduate training in nutritional biochemistry and metabolism. I founded Ohana Gastroenterology and have treated over 10,000 patients across nine years of clinical practice. My focus is evidence-based digestive health, nutrition science, and disease prevention.


    #DigestiveHealth #GutHealth #ColonCancerPrevention #Gastroenterologist #ColonoscopyScreening

    Show more Show less
    15 mins
  • Everything You've Been Told About Probiotics Is Wrong
    Apr 23 2026

    📌 Looking to get into a new diet or need a Gastroenterologist? Visit: www.drmelona.com

    Here's what the supplement industry will not tell you: most probiotics were never tested for your specific condition.

    The research that exists is strain-specific and condition-specific. A product that helped someone with antibiotic-associated diarrhea does not automatically help your bloating, your IBS, or your immune system.

    In this video, I break down five truths about probiotics that the science actually supports, and show you what actually moves the needle for your gut health.

    ⏱️ TIMESTAMPS
    0:00 Why your probiotic probably isn't doing anything
    1:52 Truth 1: The evidence problem with most probiotics
    4:07 Truth 2: Why probiotics can make things worse
    6:42 Truth 3: What "gut health" on a label actually means
    8:48 Truth 4: What actually improves your microbiome
    10:17 Stop this, start this: actionable steps for gut health
    11:14 Truth 5: Why getting evaluated changes everything
    14:34 Final thoughts: stop guessing, build a gut that works

    ❓ QUESTIONS ANSWERED

    Q: Do probiotics actually work?

    A: It depends on the strain and the condition. Most products on shelves have never been tested in clinical trials for the specific symptoms you are addressing. Probiotic research is strain-specific and condition-specific, not one-size-fits-all.

    Q: Why do probiotics make some people more bloated?

    A: If your gut is already disrupted by bacterial overgrowth, an inflamed gut lining, or dysbiosis, adding bacteria through a supplement can increase fermentation, gas, and bloating. The gut environment needs to be stabilized before probiotics can do any good.


    Q: What actually improves gut health if not probiotics?

    A: The strongest predictor of microbiome diversity is the variety of plant foods you eat each week. Eating 30 or more different plant species, including fruits, vegetables, legumes, whole grains, nuts, seeds, herbs, and spices, does more for your gut bacteria than any capsule on the market.


    📱 RESOURCES
    Website: www.drmelona.com
    Books By Dr Mel Ona: https://drmelona.com/media/
    Patient Resources: https://drmelona.com/patient-portal/
    Instagram: https://www.instagram.com/drmelonagi

    Unsedated Colonoscopy Video: https://www.youtube.com/watch?v=-Vz1lXF0rmo

    🔔 Subscribe for evidence-based digestive health, nutrition science, and disease prevention from a board-certified gastroenterologist.


    ABOUT DR. MEL ONA:

    I'm Dr. Mel Ona, a board-certified gastroenterologist with graduate training in nutritional biochemistry and metabolism. I founded Ohana Gastroenterology and have treated over 10,000 patients across nine years of clinical practice. My focus is evidence-based digestive health, nutrition science, and disease prevention.



    #GutHealth #Probiotics #GutMicrobiome #GastroenterologyEducation #DigestiveHealth

    Show more Show less
    15 mins
  • Why You're Always Bloated (And How to Fix It) A GI Doctor Explains
    Apr 23 2026

    📌 Looking to get into a new diet or need a Gastroenterologist? Visit: www.drmelona.com

    You cut out gluten. You cut out dairy. You tried low-FODMAP.

    You took every probiotic on the shelf.

    You're still bloated every single day.

    The reason nothing has worked is that you've been chasing the wrong cause.

    In this video, I walk you through the five real reasons your bloating keeps coming back, including one you can act on tonight.

    ⏱️ TIMESTAMPS
    00:00 Why the usual fixes keep failing
    01:21 Reason 1: You're treating symptoms without a diagnosis
    02:43 Reason 2: Gut bacteria imbalance and why probiotics may be making it worse
    04:38 Reason 3: How you eat matters as much as what you eat
    06:15 Reason 4: You're not eating enough fiber
    09:07 Reason 5: The gut-brain connection and how stress is bloating you
    10:49 What to do tonight

    ❓ QUESTIONS ANSWERED

    Q: Why am I always bloated even when I eat healthy?

    A: Bloating is a signal, not a diagnosis. Even a clean diet cannot fix bloating if the root cause has never been found. The issue could be bacterial overgrowth (SIBO), a motility problem, food intolerances, gut dysbiosis, or low fiber intake. Without knowing which one, every intervention is a guess. A proper evaluation is the first step. (01:21)

    Q: Can probiotics make bloating worse?

    A: Yes. If you have bacterial overgrowth or an inflamed gut lining, adding more bacteria through supplements can increase gas and bloating rather than reduce it. The probiotic market is loud, but the science is more nuanced. In many cases, the underlying imbalance needs to be corrected first before probiotics can be useful at all. (02:43)

    Q: Does stress cause bloating?

    A: Yes, and it is physiology, not a vague idea. The vagus nerve directly connects your brain to your digestive tract. When you are chronically stressed, your nervous system shifts into survival mode. Digestion gets deprioritized, motility becomes erratic, and the gut lining grows more sensitive. Gas and bloating follow. You cannot fix the gut without calming the nervous system. (09:07)

    📱 RESOURCES
    Website: www.drmelona.com
    Books By Dr Mel Ona: https://drmelona.com/media/
    Patient Resources: https://drmelona.com/patient-portal/
    Instagram: https://www.instagram.com/drmelonagi

    Unsedated Colonoscopy Video: https://www.youtube.com/watch?v=-Vz1lXF0rmo

    🔔 Subscribe for evidence-based digestive health, nutrition science, and disease prevention from a board-certified gastroenterologist.

    ABOUT DR. MEL ONA:

    I'm Dr. Mel Ona, a board-certified gastroenterologist with graduate training in nutritional biochemistry and metabolism. I founded Ohana Gastroenterology and have treated over 10,000 patients across nine years of clinical practice. My focus is evidence-based digestive health, nutrition science, and disease prevention.




    #GutHealth #Gastroenterologist #DigestiveHealth #GutHealthTips #ColonCancer #ColonoscopyScreening #FiberForGutHealth #GutMicrobiome

    Show more Show less
    13 mins
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