Even when stored as directed (in a cool, dry place), macadamia nut canisters and rice containers can be damaged. It’s not as obvious and unpleasant as keeping moldy tomatoes and bluish meat fillets in the fridge, but grains and nuts expire. But why does this happen?
Like other foods, these groups thick, carbohydrate And protein molecule. Over time, these major nutrients mix with each other and around them, changing their taste, texture, and your appetite for them.
It’s important to note that “getting worse” can mean a lot. Obviously, nuts and grains can be ruined. According to Julian De La Rue, a sensory and consumer scientist at the University of California, Davis, these foods can be contaminated with mold and yeast if not properly stored. However, grains and nuts can also expire. This means that over time, the desired sensory traits are lost.
For foods like nuts and nuts, it is the fat content that leads them to expire. Nuts are high in polyunsaturated fatty acids (PUFAs). PUFA brain With function heart Health, according to the Centers for Disease Control and Prevention (CDC). However, PUFAs are particularly sensitive to a process called oxidation. oxygen Effectively breaks double bonds in the molecule. Oxidation changes the structure of fat, so it also changes the smell and taste. According to De La Rue, once the oxidation process begins, it can spread rapidly to bags and jars. Walnuts have the highest PUFA content, so it is best to store them in the refrigerator (or freezer if stored for more than a month) to prevent oxidation. Blog post From the Institute of Food and Agricultural Sciences, University of Florida.
De La Rue told Live Science that he can recognize nuts that have been scented. However, the sensitivity to sensory characteristics varies from person to person. “Unfortunately, I’m part of a sensitive group,” said De La Rue, who even picks up the subtle odor of stinking oxidized nuts. According to De La Rue, expiration labels are useful if you’re less sensitive to odors and don’t want to endanger small tastes.
Oxidation is associated with many diseases such as cancer and cancer, so eating oxidized foods is never recommended Heart disease.. However, if the expired nuts are properly stored, there is no risk of mold growth. Due to the relatively small amount of exposure, eating from time to time should not harm your health. It may be unpleasant.
Grains such as Quinoa Oats can last much longer than nuts, according to De La Rue. But they change over time, thanks to what is called a stall. “Older is a common term for affecting textures,” says De La Rue.
In the case of cereals, aging is caused by molecular rearrangements of starch and proteins. gluten, It makes up the grain. The starch and gluten molecules “slightly rearrange and bind to each other, making the texture coarser or harder,” he said. This added stiffness means that the grains are hydrated or gelatinized — the process of making them soft, tasty and easy to digest — less efficient.
That’s why consumers in many parts of Asia are aware of the year of harvest when buying rice, according to De La Rue. Fresh rice is preferred as it is cooked most efficiently. And if these consumers have old rice, they adjust the cooking method to explain the fact that the rice is not so fresh.
However, a little old grain is not really harmful. “Cereals can be stored for years as long as they are properly dried and stored at low temperatures, so don’t waste your food,” says De La Rue.
Originally published in Live Science.
Why do nuts and grains go bad? Source link Why do nuts and grains go bad?