How to Use Plastic Food Storage Containers

Whether you're on a quest to prevent food waste or you simply want to store prepared food, reusable containers can do the job. But are some food containers safer than others when it comes to personal and environmental health? Here's what you need to know.

• Know the code. On the bottom of plastic food storage containers, you'll find a tiny triangle with a number (resin identification code) ranging from 1 to 7. This number indicates what the plastic is made of. In general, the safest choices for food use are numbers 1, 2, 4 and 5. The American Academy of Pediatrics recommends avoiding plastic containers with codes 3, 6 and 7. Plastic number 3 contains vinyl or polyvinyl chloride (PVC), 6 has polystyrene and 7 can contain various plastics, such as Bisphenol A (BPA).
  • The use of BPA has been banned in baby bottles, sippy cups and in the packaging of infant formulas. However, its use in other food and beverage containers continues to be monitored and is currently considered safe by the U.S. Food and Drug Administration. Many BPA-free plastic food and beverage containers are available today, allowing consumers to minimize their exposure to it.
• Keep it cool. Though polycarbonate plastic is strong and long-lasting, it can break down over time from high temperatures and overuse. Never microwave foods in plastic food containers, including margarine tubs and restaurant carryout containers. Plastic containers from packaged microwavable meals shouldn't be reused after their initial use; they're safely designed for one-time-use only. Putting plastic containers in the dishwasher should also be avoided.
• Recycle as appropriate. According to the Environmental Protection Agency (EPA), the U.S. recycled just over 8% of plastic containers and packaging in 2017. This can contribute to greenhouse gas (GHG) emissions, impacting the health of the environment.

The Bottom Line

Pick plastic food containers wisely and limit their use to cold food storage. They can also be ideal for transporting food. Consider glass or stainless steel containers for cold or hot foods, instead. Since both can be cleaned and reused, they're ideal for home food storage, too.

Jackie Newgent, RDN, CDN, is a Brooklyn-based culinary nutritionist, writer and media personality.