diff --git a/docx2everything/converters/markdown_converter.py b/docx2everything/converters/markdown_converter.py
index 0ff408f..d6d1f8b 100644
--- a/docx2everything/converters/markdown_converter.py
+++ b/docx2everything/converters/markdown_converter.py
@@ -65,6 +65,22 @@ def get_heading_level(pStyle_val, styles_info=None):
     return None
 
 
+def is_on_off_enabled(elem):
+    """
+    Returns the effective value of an OpenXML CT_OnOff element.
+
+    Missing w:val defaults to true; explicit 0/false/off disables it.
+    """
+    if elem is None:
+        return False
+
+    val = elem.get(qn('w:val'))
+    if val is None:
+        return True
+
+    return val.strip().lower() not in ('0', 'false', 'off')
+
+
 def parse_run_to_markdown(r_elem, hyperlinks=None, images=None, img_dir=None, zipf=None, link_url=None, footnotes=None, endnotes=None):
     """
     Converts a text run (<w:r>) to markdown with formatting.
@@ -115,10 +131,10 @@ def parse_run_to_markdown(r_elem, hyperlinks=None, images=None, img_dir=None, zi
     
     # Apply formatting (check all formatting first, then apply appropriately)
     if rPr is not None:
-        is_bold = rPr.find(qn('w:b')) is not None
-        is_italic = rPr.find(qn('w:i')) is not None
-        is_strike = (rPr.find(qn('w:strike')) is not None or 
-                     rPr.find(qn('w:delText')) is not None)
+        is_bold = is_on_off_enabled(rPr.find(qn('w:b')))
+        is_italic = is_on_off_enabled(rPr.find(qn('w:i')))
+        is_strike = (is_on_off_enabled(rPr.find(qn('w:strike'))) or
+                     is_on_off_enabled(rPr.find(qn('w:delText'))))
         
         # Apply formatting in correct order (strikethrough, then bold/italic)
         if is_strike:
diff --git a/tests/test_markdown_run_onoff.py b/tests/test_markdown_run_onoff.py
new file mode 100644
index 0000000..47e7c23
--- /dev/null
+++ b/tests/test_markdown_run_onoff.py
@@ -0,0 +1,73 @@
+import xml.etree.ElementTree as ET
+
+from docx2everything.converters.markdown_converter import parse_run_to_markdown
+
+
+W_NS = "http://schemas.openxmlformats.org/wordprocessingml/2006/main"
+
+
+def run_with_property(property_name, value_marker):
+    value_attr = "" if value_marker is None else f' w:val="{value_marker}"'
+    xml = f"""
+    <w:r xmlns:w="{W_NS}">
+      <w:rPr>
+        <w:{property_name}{value_attr}/>
+      </w:rPr>
+      <w:t>Body text</w:t>
+    </w:r>
+    """
+    return ET.fromstring(xml)
+
+
+def test_disabled_bold_values_are_not_rendered_as_bold():
+    for value in ("0", "false", "off"):
+        run = run_with_property("b", value)
+
+        markdown = parse_run_to_markdown(run)
+
+        assert markdown == "Body text"
+
+
+def test_enabled_bold_values_are_rendered_as_bold():
+    for value in (None, "1", "true", "on"):
+        run = run_with_property("b", value)
+
+        markdown = parse_run_to_markdown(run)
+
+        assert markdown == "**Body text**"
+
+
+def test_disabled_italic_values_are_not_rendered_as_italic():
+    for value in ("0", "false", "off"):
+        run = run_with_property("i", value)
+
+        markdown = parse_run_to_markdown(run)
+
+        assert markdown == "Body text"
+
+
+def test_enabled_italic_values_are_rendered_as_italic():
+    for value in (None, "1", "true", "on"):
+        run = run_with_property("i", value)
+
+        markdown = parse_run_to_markdown(run)
+
+        assert markdown == "*Body text*"
+
+
+def test_disabled_strike_values_are_not_rendered_as_strikethrough():
+    for value in ("0", "false", "off"):
+        run = run_with_property("strike", value)
+
+        markdown = parse_run_to_markdown(run)
+
+        assert markdown == "Body text"
+
+
+def test_enabled_strike_values_are_rendered_as_strikethrough():
+    for value in (None, "1", "true", "on"):
+        run = run_with_property("strike", value)
+
+        markdown = parse_run_to_markdown(run)
+
+        assert markdown == "~~Body text~~"