Whole grains are rich in dietary fiber, which can affect the body's absorption of nutrients such as calcium and iron. Although whole grains are beneficial, they are not suitable for everyone, and people with certain constitutions should avoid eating them frequently.
The refinement and sophistication of modern life have become a cause of many nutritional diseases. Diabetes, gout, hypertension, colon tumors, obesity, and others are gradually threatening human health.
"Whole grains" are a relative term referring to grains that are less processed and refined compared to more formally and finely processed grains. They mainly include corn, millet, purple rice, sorghum, oats, buckwheat, wheat bran from the cereal category, as well as various dried beans such as soybeans, green beans, red beans, and mung beans. It is undeniable that advocating for the moderate consumption of whole grains can prevent disease. This is because fiber can inhibit cholesterol absorption, reduce hyperlipidemia, promote intestinal peristalsis, and prevent constipation; while B vitamins, especially vitamin B1, can prevent beriberi. At the same time, many whole grains also have medicinal value. For example, buckwheat contains "chlorophyll" and "rutin," which are not found in other grains, and can be used to treat hypertension. However, excessive intake of whole grains can also be detrimental to health. Firstly, whole grains themselves are not highly nutritious, they are difficult to digest, and their absorption rate is low. Secondly, the dietary fiber rich in whole grains can affect the body's absorption of nutrients such as calcium and iron. Although whole grains are good, they are not suitable for all people, and some people with special constitutions should not eat them often.
People with poor gastrointestinal function
For people with weak gastrointestinal function, eating too much dietary fiber is a great burden on the digestive system.
People deficient in elements like calcium and iron Because whole grains contain phytic acid and dietary fiber, they can form precipitates that hinder the body's absorption of minerals.
People with digestive system diseases If suffering from liver cirrhosis with esophageal varices or a stomach ulcer, consuming large amounts of whole grains can easily cause variceal rupture and bleeding or ulcer bleeding.
People with low immunity If the daily intake of fiber exceeds 50 grams over a long period, it can impede protein supplementation, reduce fat utilization, and cause damage to the functions of organs such as bones, the heart, and blood, thereby lowering the body's immune capacity.
People with heavy physical activity
Whole grains have low nutritional value and provide little energy, which is insufficient for people engaged in heavy physical labor.
Adolescents in the period of growth and development Due to the special nutritional and energy demands for growth and development and the physiological requirements for hormone levels, whole grains not only hinder cholesterol absorption and its conversion into hormones but also interfere with the absorption and utilization of nutrients.
The elderly and children Because the digestive function of the elderly declines, and the digestive function of children is not yet fully developed, digesting large amounts of dietary fiber is a great burden on the gastrointestinal system. Moreover, the absorption and utilization of nutrients are relatively low, which is not conducive to the growth and development of children.
Nutritionists point out that eating whole grains is necessary, but it is important to pay attention to a mix of coarse and fine grains, and also to pair them with nutrient-rich foods. For example, cook coarse grains into porridge or mix them with fine grains, and pair them with protein and mineral-rich foods to aid absorption. At the same time, people who are not suitable for eating large amounts of whole grains should minimize their consumption to avoid malnutrition.