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Almost all refrigerators on the market, when purchased, come with an accessory designed specifically for this purpose: an egg cup that goes on the shelves of the appliance door. This has become the place that many of us look at at first to catch the eggs, but the truth is that it is the worst refrigerator place to save the eggs. The thermal trap. The reason lies not in the fragility of the food, but in a microscopic enemy that surrounds us and can be potentially dangerous: the Salmonella. Here the main problem with the refrigerator door is that it is the area most exposed to thermal changes, since every time we open the refrigerator to get milk, water or simply to think about what to eat, the temperature on the door shelves fluctuates drastically. Here are the regulatory bodies of the United States They are quite clear pointing out that these constant rises and falls in temperature are the ideal breeding ground for bacterial growth. Furthermore, as pointed out by the South Korean Ministry of Food, the door is prone to generate condensation, creating a humid environment that facilitates the proliferation of pathogens in the shell that end up in the food when we break the eggs in the same bowl where we beat them (something also not recommended). The ideal temperature. To keep salmonella at bay, the temperature must be stable and below 4°C – 10°C, since under these conditions, the growth of the bacteria is suppressed by more than 99%. But this on the refrigerator shelves is something that is not always achieved. What the studies say. Here the science is quite clear with different studies that have pointed to the survival of strains such as Salmonella Typhimurium and the Salmonella Enteritidis in very specific conditions. A 2021 study demonstrated that at room temperature the bacterial load increases alarmingly in both the white and the yolk. On the contrary, keeping them at 5ºC limits their multiplication and reduces virulence. But if we come more to the present, a study launched in 2024 found that, under alternating temperature conditions, that is, in cycles of 25 ºC to 5 ºC, similar to taking food in and out of the refrigerator, salmonella manages to migrate to the yolk in 64% of cases. How to preserve them. Taking all this into account, the big question is: what should we do when we get home from the supermarket? In this case, the health authorities point to two strategies, the first being to put them directly on the interior shelves, preferably on the lower or middle ones. In this way, the temperature remains stable below 4ºC, and especially if it is at the bottom of the refrigerator. Do not throw away the cardboard. Although we usually take eggs out of their boxes to put them in plastic egg cups for convenience, the truth is that it is a mistake. That is why the second conservation strategy is to keep them in the original packaging, since the cardboard not only protects them from possible knocks, but also acts as a crucial barrier against moisture loss, prevents the shell from absorbing odors from other foods and protects the egg’s natural cuticular barrier. Images | Onur Burak Akın Katie Bernotsky In Xataka | The internet has become obsessed with drinking hot water in the morning. Science is clear about what it does (and what it doesn’t)