Is it safe to use ceramic-glazed pottery for cooking acidic foods like tomato sauce?
No. Cooking acidic foods like tomato sauce in certain glazed pottery can cause lead to leach directly into your meal, according to a 2026 study in the Journal of Public Health Management and Practice.
What's actually in it
Many traditional ceramic glazes contain lead. Lead is a heavy metal that is toxic to the human body. When you cook food that is acidic, such as tomato sauce, the acid acts as a solvent. It breaks down the glaze and pulls the lead out of the pottery and into your food.
This isn't just a theory. It is a chemical reaction that happens every time you heat acidic ingredients in cookware that hasn't been properly tested or manufactured for food safety.
What the research says
A 2026 study in the Journal of Public Health Management and Practice analyzed glazed pottery sold at the Mexico-US border. The peer-reviewed research found that cooking acidic foods in these vessels leads to the enhanced leaching of soluble lead.
Because the acid in your sauce directly interacts with the glaze, you end up consuming the metal that was meant to stay on the surface of the pot. If you are using pottery that isn't explicitly certified as lead-free, you are likely exposing yourself to this heavy metal every time you cook.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Enhanced Leaching of Soluble Lead by Cooking Acidic Food in Glazed Pottery Sold at the Mexico-US Border. | J Public Health Manag Pract | 2026 |
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