### Examples from Studies
* Type O blood has been associated with a **lower risk** of certain infections, but sometimes a **higher risk** of others
* Type A blood may be more reactive to certain inflammatory immune responses
* Type AB blood shows mixed patterns due to having both A and B antigens
### What This Means (and Doesn’t Mean)
This does **not** mean your blood type makes you immune—or doomed. It simply reflects subtle biological interactions.
**Takeaway:**
Your blood type may influence how your immune system responds, but hygiene, vaccines, and overall health are far more important.
## Hidden Clue #3: Blood Type and Digestive Patterns
You may have heard claims that blood type dictates the “perfect diet.” While extreme versions of this idea are controversial, research does suggest blood type may influence **digestive traits**.
### Stomach Acid and Enzymes
Some studies indicate:
* Type O individuals may produce higher stomach acid levels
* Type A individuals may produce lower stomach acid on average
