Nowadays, people often sit in offices and rarely exercise. This can lead to lower back discomfort and kidney deficiency. Kidney deficiency can cause symptoms such as cold intolerance, lower back and knee weakness, frequent urination at night, dry mouth, hot flashes, and insomnia. You can check for any of these symptoms yourself. For quick results, see a doctor and get medication. However, if you prefer not to take medication, paying more attention to your diet can also improve kidney deficiency.
The food I'm talking about is leeks, which contain zinc, sulfide, vitamin E, and dietary fiber. These elements are very beneficial for kidney health. Zinc is essential for sperm production and testosterone synthesis. Sulfide promotes engorgement of the corpus cavernosum (improving erectile function) and can also prevent prostatitis (indirectly protecting the kidneys). Vitamin E reduces free radical damage to kidney cells, slowing gonadal decline (anti-aging). Dietary fiber promotes intestinal motility, reduces toxin retention, reduces the metabolic burden on the kidneys, regulates blood lipids, and prevents renal artery sclerosis.

This is why leeks can nourish the kidneys, so you can eat them without worry. Next, I recommend a dish that you can make at home.
Ingredients (serves 2):
(1) 200g leeks (choose those with more tender leaves and white roots for better fragrance).
(2) 80g raw walnut kernels (or 50g cooked walnut kernels).
(3) 2 cloves of garlic (sliced).
(4) ½ red bell pepper (shredded, for color, optional).
(5) ½ teaspoon salt.
(6) ¼ teaspoon sugar (for flavor).
(7) A few drops of sesame oil (add before serving).
(8) 1 tablespoon cooking oil.
Detailed steps:
(1) Pre-process ingredients:
Leek: Remove the old skin at the root and cut into 4cm long segments (separate the roots and leaves);
Walnut kernels: Soak the raw walnut kernels in boiling water for 5 minutes (to remove the astringency), drain and set aside (omit if using cooked walnut kernels);
Slice the garlic and shred the red bell pepper (optional).
(2) Stir-fry the walnut kernels (key step!):
Put 1 tablespoon of oil in a cold pan, add the walnut kernels over low heat and stir-fry for 2 minutes until slightly browned, then remove and set aside (⚠️Pay attention to the heat to avoid burning).
(3) Stir-fry the leek:
Use the remaining oil in the pan (or add a little oil) and sauté the garlic slices over medium-high heat;
First add the leek roots and stir-fry quickly for 10 seconds;
Then add the leek leaves and red bell pepper shreds, add salt and sugar, and stir-fry for 15 seconds until cooked (leek leaves are softened).
(4) Mix and serve:
Pour in the walnut kernels, drizzle with a few drops of sesame oil, stir well, and immediately turn off the heat (to keep the walnuts crisp).

Walnut kernels are added to the stir-fry because they also have the effect of nourishing the kidneys, so you can add them without worry. If you don't have walnut kernels, you can also omit them and replace them with eggs, which will have the same kidney-tonifying effect. In fact, in addition to leeks, there are also shrimp, pork liver, black sesame seeds, oysters, etc. You can explore them yourself.