Cadmium and lead in spinach and ways to reduce exposure
What it found
Cadmium and lead behave differently in soil, in spinach plants, and in the human body.
Because of this, reducing exposure requires different approaches for each metal.
What they found
Studies in people and animals
Different metals, different behaviour
Cadmium and lead act differently in soils and in how spinach takes them up and stores them. The human body also absorbs, moves, breaks down, and removes each metal in its own way. Other nutrients in the food and a person's nutrition level change this too.
Other findings
No single fix
Because the two metals behave so differently, there is no one consistent way to cut human exposure from plant foods. Each metal and plant pairing needs its own approach.
Lowering chloride inputs
The authors point out that cutting chloride added to fields could make less cadmium available for leafy greens to take up. More research should look into this strategy.
Oxalate and cadmium absorption
Spinach contains oxalate, which may lower how much cadmium the body absorbs. The authors say more research is needed on this role.
Grower and consumer education
Interviews with stakeholders showed a need for better testing facilities. Growers and shoppers also need more education about these metals in leafy greens.
What the authors conclude
- They note that their findings apply to other leafy greens like kale and lettuce, but not to other plants or metals.
- They call for more research on cutting chloride use to lower cadmium uptake by leafy greens.
- They recommend better testing facilities and more education for both growers and shoppers.
How it was done
Plant foods can expose people to metals like cadmium and lead, but each metal acts differently in soil and inside plants. The authors wanted to explore these differences using spinach as an example, partly to support efforts to lower children's exposure to toxic elements from food.
The authors examined how spinach takes up cadmium and lead from soil and how the human body handles them. They also spoke with stakeholders about what growers need and what strategies are practical. They looked at research gaps and future needs for lowering exposure.
What it can’t tell you
- We summarised it from the abstract only.
- This work looks at how metals move through soil, plants, and bodies rather than measuring health outcomes in people. It cannot show whether eating spinach causes specific health problems.
- Some ideas, like oxalate lowering cadmium absorption, still need more research before scientists know how they work in everyday diets.
Who paid
- Conflicts
- The authors declare no conflicts of interest relevant to this study.
The paper
- Title
- Mitigating Toxic Metal Exposure Through Leafy Greens: A Comprehensive Review Contrasting Cadmium and Lead in Spinach
- Type
- ReviewThe authors read earlier studies and describe what they found. It isn’t a new study.
- Evidence
- Studies in people · animals · lab
- Summarised from
- Abstract only
- Cite
- Seyfferth AL, Limmer MA, Runkle BRK, Chaney RL (2024). Mitigating Toxic Metal Exposure Through Leafy Greens: A Comprehensive Review Contrasting Cadmium and Lead in Spinach. GeoHealth. doi:10.1029/2024GH001081Free full textPubMed 38887469DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error