Dietary Principles for Winter
Winter is a season of cold weather and flourishing yin with declining yang. Under the influence of cold temperatures, the body's physiological functions and appetite undergo changes. Therefore, it is essential to adjust the diet reasonably to ensure an adequate supply of essential nutrients for the elderly, enhancing their cold tolerance and immune function to ensure they pass the winter safely and smoothly.
First, ensure an adequate supply of energy. The cold climate of winter affects the body's endocrine system, increasing the secretion of hormones like thyroid and adrenal hormones. This promotes and accelerates the breakdown of the three major energy-providing nutrients—proteins, fats, and carbohydrates—to increase the body's cold resistance, which in turn leads to excessive heat loss. Consequently, the nutritional focus in winter should be on increasing energy intake, which can be achieved by consuming more foods rich in carbohydrates and fats. For the elderly, fat intake should not be excessive to avoid triggering other health issues. However, adequate protein intake is necessary because protein metabolism is enhanced, leading to a negative nitrogen balance in the body. Protein should account for 15-17% of total calories, primarily from high-quality sources such as lean meat, eggs, fish, dairy, and legumes and their products. The protein in these foods is not only easily digested and absorbed but also rich in essential amino acids, offering high nutritional value to improve the body's cold tolerance and disease resistance.
Winter is also the off-season for vegetables, with limited variety and quantity, a more pronounced phenomenon in northern China. As a result, vitamin deficiencies, such as a lack of Vitamin C, can occur over the winter, leading to symptoms like oral ulcers, swollen and bleeding gums, and constipation in many elderly individuals. The primary preventive and therapeutic measure is to diversify food sources. As green leafy vegetables become relatively scarce, root vegetables like sweet potatoes and potatoes can be consumed. They are rich in Vitamins C and B, and sweet potatoes, in particular, are a good source of beta-carotene (Vitamin A). Eating more root vegetables not only replenishes vitamins but also helps clear internal heat and expel toxins. Additionally, among the common winter vegetables, besides Chinese cabbage, one should also choose varieties like cabbage, watermelon radish, daikon radish, carrots, soybean sprouts, mung bean sprouts, and rape. These vegetables are generally rich in vitamins. By frequently rotating varieties and combining them wisely, the body's vitamin needs can be met.
The cold of winter can also affect the body's nutritional metabolism, increasing the consumption of various nutrients to varying degrees. Due to factors affecting digestion, absorption, and metabolism, the elderly often lack elements like potassium, calcium, sodium, and iron. Furthermore, increased urination in winter leads to a greater loss of these inorganic salts in urine, so they should be replenished promptly. One can eat more foods rich in calcium, iron, sodium, and potassium, such as dried shrimp, shrimp skin, sesame paste, pork liver, and bananas. For those with low sodium levels, slightly increasing the saltiness of dishes can help supplement it.