In our daily diet, sweet potatoes, white potatoes, and purple potatoes are often widely welcomed for their rich nutrients and low prices**, becoming an indispensable part of a healthy diet. However, when they are placed side by side on the market stalls, have you ever wondered if the differences between them are not just in color? In this article, we'll take a closer look at these three different types of potatoes, uncover their unique nutritional values and health benefits, and take you through which potato can be called the "king of whole grains". 
Since ancient times, these potatoes have been a cornerstone of the diet of many cultures as a representative of whole grains. However, as scientific research has deepened, people are beginning to realize that they are more than simple fillers when you are hungry. In fact, sweet potatoes, white potatoes, and purple potatoes are rich in dietary fiber, vitamins, minerals, and antioxidants, and their nutritional value is far beyond our imagination. But which potato can win the nutrition duel and become the real "king of coarse grains"? It's not just a question of color, it's also a question of healthy choices. Potatoes, as one of the staple foods widely cultivated and consumed worldwide, have a wide variety of varieties, mainly including sweet potatoes, white potatoes and purple potatoes. These seemingly simple foods are actually rich in nutrients and health benefits hidden behind the color. Sweet potatoes are known for their orange-red flesh and are rich in carotene; White potatoes, with milky white flesh, are good for dietary fiber**; The purple sweet potato attracts everyone's attention with its unique purple flesh and high anthocyanin content. Nutrition and Health Benefits of Sweet Potatoes: Nature's Treasure House of NutrientsSweet potatoes, as "nature's treasure trove of nutrients", are not only loved for their sweet taste, but also widely revered for their rich nutritional value. Sweet potatoes are rich in carotene, a powerful antioxidant that can be effectively converted into vitamin A, which boosts immunity and protects eyesight. In addition, the high dietary fiber content of sweet potatoes has a non-negligible effect on maintaining digestive health and preventing constipation. The dietary fiber in sweet potatoes is especially important for middle-aged and elderly people, it can not only help control blood sugar levels, but also slow down the rate of blood sugar rise, and sweet potatoes are an ideal food choice for people with abnormal sugar metabolism. At the same time, the rich potassium in sweet potatoes helps to maintain cardiovascular health and prevent increased blood pressure in the systemic arteries. When it comes to serving recommendations, sweet potatoes are extremely flexible and can be cooked in a variety of ways, such as roasting and steaming, while retaining nutrients while bringing out the best flavor. For middle-aged and elderly people, a reasonable arrangement of the proportion of sweet potatoes in the daily diet can not only enrich the taste of the diet, but also effectively supplement a variety of nutrients required in daily life. 
White potatoes, often misunderstood as the light-colored brother of sweet potatoes, are hidden in essence with hidden nutritional treasures. Compared to its brightly colored relatives, sweet potatoes dominate in terms of dietary fiber and potassium content. Not only does this root plant provide stable energy**, but it also supports heart health, making it ideal for people with high blood pressure and abnormal glucose metabolism. When cooked, its mild taste and low sweetness provide a broad stage for a wide variety of dishes, from steaming to roasting, sweet potatoes can be perfectly integrated to enrich our table. Purple potato, with its bright purple color, attracts attention, not only for its appearance, but more importantly, for its internal anthocyanin content. Anthocyanins, a powerful antioxidant, are able to scavenge free radicals and protect cells from damage, thereby slowing down the aging process and boosting immunity. For middle-aged and elderly people, purple potatoes can not only add color to the diet, but also one of the secrets of health and longevity. Adding purple potatoes to your daily diet can effectively prevent cardiovascular diseases and improve your quality of life. 
Choosing the "king of coarse grains" among sweet potatoes, white potatoes, and purple potatoes is not a simple task. Each potato has its own unique nutritional value and health benefits. Sweet potatoes are known for their abundance of carotene, white potatoes are unique in providing dietary fiber and potassium, and purple potatoes have an anthocyanin content that the other two can't match. Therefore, the key to the selection is not which potato is definitely better than the other, but how to make a reasonable selection and combination according to the individual's health needs and nutritional goals. Scientific consumption of potatoes means finding a balance in the daily diet and combining the unique advantages of various potatoes to achieve the goal of comprehensive nutrition. For example, patients with cardiovascular disease can increase their intake of purple potatoes to take advantage of their antioxidant properties; For those who need to control their blood sugar, they can eat sweet potatoes in moderation and use their stable energy release. In this way, each potato can become the "king of whole grains" on our table.