The reason why egg yolks have different colors
The color of the egg yolk is mainly affected by the hen’s diet. If the hen consumes foods rich in natural pigments (such as lutein, zeaxanthin, carotene, etc.), such as marigold petals, corn or green leafy vegetables, the yolk color of the egg produced will be darker.
But it should be noted that the color of the egg yolk does not significantly affect the content of core nutrients such as protein and fat. Dark egg yolks may contain slightly more fat-soluble vitamins (such as vitamin A) and antioxidants (such as lutein), but the overall nutritional value is no different from that of light-colored egg yolks.
Dark yolks may be slightly better in some trace nutrients, but the overall nutritional value of eggs depends on their freshness and source, not color alone.
How to choose good eggs scientifically?
1. Visual inspection
✅Eggshell condition: Choose eggs with a layer of natural frost on the surface and no cracks. The rougher the shell, the fresher it is.
✅Cleanliness : Avoid buying eggs with chicken manure on them, as they pose a higher risk of sanitation.
2. Sensory judgment
✅Shaking method: Gently shake the egg. If there is no liquid shaking sound, it means the egg white is dense and fresh.
✅Observation through light: When shining a flashlight, fresh eggs appear slightly reddish and translucent, and the outline of the yolk is clearly visible.
3. Purchase channels
✅Prefer clean eggs: eggs that have been cleaned, disinfected and graded are safer.
✅Check the production date: Choose eggs with clearly visible spray-coded dates, which makes it easier to trace freshness.
4. Variety selection
✅Free range eggs: The yolk is darker, but the nutritional difference is not big. When purchasing, pay attention to the health risks brought by the free range environment.
✅Raised eggs: The nutrient ratio is more balanced and the overall safety is more guaranteed.
Tips:
🥚When choosing eggs, freshness is more important than the color of the yolk.
🥚After purchasing eggs, it is recommended to refrigerate and store them below 4°C, which can generally keep them fresh for 30-40 days.
🥚Buy through regular channels and eat with more peace of mind!
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