Can high tin exposure during pregnancy raise birth defect concerns?
caution
What is actually in it
Tin can enter food from tinplate packaging. Levels depend on the can, the food, the lining, acidity, oxygen, storage time, and storage temperature.
Canned tomatoes, fruit, and other acidic foods are the kinds of foods people usually ask about. The stronger rule is simple: do not store leftovers in an opened can. Move them to glass before refrigerating.
What the research says
A 2026 Environ Toxicol study looked at tin and neural tube defects. In a human case-control analysis, higher maternal serum tin was linked with higher neural tube defect risk. In pregnant mouse models, tributyltin exposure caused neural tube defects through oxidative stress, MAPK signaling, and cell death in developing neural tissue.
A separate 2002 Anal Bioanal Chem paper explains that tin can enter food from packaging and that higher levels are found in processed and canned foods.
This does not prove canned food causes birth defects. The pregnancy study looked at tin exposure and tributyltin mechanisms, not a canned-food diet trial. It is enough reason to reduce easy tin-contact points during pregnancy.
The bottom line
If you are pregnant or trying to conceive, use fresh, frozen, or glass-jar foods when practical. When you do use canned food, do not store leftovers in the can. Move them to glass storage right away.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| From Association to Mechanism: Excessive Exposure to Tin During Pregnancy May Cause Fetal Neural Tube Defects | Environ Toxicol | 2026 |
| Determination of total tin in canned food using inductively coupled plasma atomic emission spectroscopy | Anal Bioanal Chem | 2002 |