A thermos is a useful tool for keeping beverages hot or cold, but not all drinks are suitable to be stored in it. Certain types of liquids kept in a thermos can pose potential health risks. Harmful substances may be produced through chemical reactions between the liquid and the material of the thermos, leading to digestive issues and even cancer.
5 Types of Drinks You Should NEVER Store in a Thermos: Doing So Is Like Drinking Poison!
Below are 5 drinks you should absolutely avoid storing in a thermos to protect your health and preserve the durability of this item:
1. Tea
Tea is a popular drink with many health benefits, but it is not suitable for thermos storage. Tea contains tannins, caffeine, and vitamins. When kept in a thermos for too long, the high temperature can damage these components. Vitamins in tea may be destroyed, while tannins and caffeine may be over-extracted, making the tea bitter and stripping it of its signature flavor.
Additionally, tea left in a thermos can create stubborn residue that is difficult to clean, making the thermos look and feel less hygienic.
2. Milk
Milk is a great source of nutrition, but storing it in a thermos requires extreme caution. A thermos can create a favorable environment for bacteria to thrive. This may cause the milk to spoil quickly, leading to food poisoning if consumed.
Furthermore, milk is high in protein, and when kept at high temperatures for too long, these proteins may denature, reducing the nutritional value of the milk. Therefore, if you must put milk in a thermos, drink it within one hour to ensure safety.
3. Herbal Medicine (Traditional Decoctions)
Traditional herbal medicine is widely used to treat many ailments. However, storing it in a thermos is not a good choice. The ingredients in herbal medicine are complex and may be acidic or alkaline. When they come into contact with metals such as manganese, iron, chromium, and nickel found in thermos flasks, chemical reactions may occur. This not only reduces the effectiveness of the medicine but may also produce harmful substances.
The high temperature inside the thermos can also degrade herbal medicine, causing it to lose its therapeutic properties. Therefore, instead of using a thermos, it is better to store herbal medicine in glass or ceramic cups to ensure its effectiveness.
4. Saltwater or Salty Liquids
Although thermos flasks have a corrosion-resistant layer, salty liquids can still be harmful if stored for too long. Salt compounds may corrode the inner protective layer of the thermos, and over time, heavy metals from the thermos material may leach into the liquid.
Exposure to heavy metals can negatively affect health, causing digestive problems and even heavy metal poisoning. Therefore, salty drinks such as broth or mineral water with high salt content should not be stored in a thermos.
5. Acidic Beverages and Carbonated Drinks
Fruit juices and carbonated drinks are popular, but they are not suitable for thermos storage. Fruit juices are highly acidic, which can corrode the stainless-steel lining of the thermos, damage its protective coating, and release heavy metals into the beverage. This can harm your health, especially your digestive system.
Additionally, carbonated drinks like soda can build up pressure inside a sealed thermos, creating a risk of explosion or spillage when the lid is opened. If you want to carry fruit juice or soda, use other containers such as glass bottles or ceramic cups to protect your health and maintain the quality of the drink.