You should never store certain foods and liquids in plastic containers due to potential chemical leaching, degradation of the plastic, or alteration of the food’s taste and quality. This includes highly acidic foods, fatty foods, and hot liquids, as well as certain medications and baby formula.
What You Should Absolutely Avoid Storing in Plastic Containers
While plastic containers offer convenience for food storage, it’s crucial to understand that not all plastics are created equal, and some substances should never come into contact with them. The primary concern revolves around chemical leaching, where compounds from the plastic can migrate into your food or beverages. This is especially true when plastics are heated, scratched, or exposed to certain types of food.
Why is Plastic Storage a Concern for Certain Items?
The issue isn’t just about convenience; it’s about food safety and preserving the integrity of what you’re storing. Different types of plastics have varying levels of permeability and chemical stability. When incompatible items are stored, you risk not only potential health concerns but also compromising the taste and texture of your food.
The Impact of Heat and Acidity on Plastic
Heat is a major catalyst for chemical migration. When you pour hot soup into a plastic container or microwave leftovers in one, the plastic can soften and release chemicals like BPA (Bisphenol A) or phthalates. These chemicals have been linked to various health issues.
Similarly, acidic foods can break down certain plastics more readily. Think about tomato sauce, citrus fruits, or vinegar-based dressings. When stored in the wrong plastic, these acidic substances can react with the material, potentially causing leaching and an unpleasant metallic taste.
Fatty Foods and Their Interaction with Plastic
Fatty foods also pose a unique challenge. Lipids (fats) in foods can absorb chemicals from plastic more easily than water-based foods. This means that storing oily foods, cheeses, or meats in inappropriate plastic containers could lead to a higher intake of plastic-associated compounds.
Specific Items to Keep Out of Plastic
Understanding these principles helps us identify specific items that are best stored elsewhere. Prioritizing glass containers, stainless steel, or ceramic vessels for these items is a wise choice for both health and quality.
1. Acidic Foods and Beverages
- Tomato-based sauces and pastes: The acidity can degrade certain plastics over time.
- Citrus fruits and juices: Lemon, lime, orange, and their juices are highly acidic.
- Vinegar and pickles: High acidity makes these unsuitable for long-term plastic storage.
- Wine and other acidic alcoholic beverages: While often sold in plastic, long-term storage is not recommended.
2. Fatty Foods
- Oils and dressings: Especially those with a high oil content.
- Cheeses: Particularly aged or high-fat varieties.
- Meats: Storing raw or cooked fatty meats.
- Butter and margarine: Their fat content can interact with plastic.
3. Hot Liquids and Foods
- Hot soups and stews: Always let them cool before considering any container, but glass is preferred.
- Boiling water: Never pour boiling water directly into a plastic container.
- Microwaving leftovers: Use microwave-safe glass or ceramic dishes.
4. Baby Formula and Milk
While many baby bottles are made of plastic, it’s a contentious area. For long-term storage of baby formula or breast milk, especially if it’s going to be heated, glass bottles are often recommended by health professionals to minimize potential exposure to chemicals. Always use BPA-free plastics specifically designed for baby products if plastic is unavoidable.
5. Medications and Supplements
Many medications are sensitive to their storage environment. Plastic can sometimes react with or absorb compounds from the medication, reducing its efficacy or altering its composition. Always store medications in their original packaging or in designated glass or ceramic containers.
6. Strong-Smelling Foods
While not a chemical leaching issue, strong-smelling foods like onions, garlic, or certain spices can permanently permeate plastic containers. This can leave an odor that transfers to other foods stored later. Glass or stainless steel are much better at preventing odor transfer.
Understanding Plastic Types: What Do Those Numbers Mean?
You’ve likely seen the recycling symbols with numbers inside a triangle on plastic containers. These numbers, from 1 to 7, indicate the type of plastic resin used. While not a foolproof guide to safety, some numbers are generally considered more problematic than others.
| Plastic Type (Resin ID) | Common Uses | Concerns