Because of the decreasing functions of digestion and absorption, the supplementation of various nutrients through the daily diet can be seriously affected among the senile people. After a long time, the physical immunity will be weakened and various chronic diseases like diabetes and cataract can also be induced. Therefore, it is necessary for the aged to supplement essential vitamins and mineral substances so as to satisfy the nutritional demands. 

It is necessary for the aged to understand the correct ways of supplementing vitamins. Generally speaking, two principles should be followed, namely, balanced diet and moderate drugs.

Vegetables contain abundant mineral substances, trace elements, carbohydrates and cellulose. The foods containing abundant vitamin A mainly include animal liver, diary products, eggs, carrot, spinach, cabbage, apricot and so on. The foods containing vitamin D mainly include egg yolk, animal liver and milk. Abundant vitamin E can be found in seed fat extracted from various vegetables and grain. Vitamin B1 is mainly contained in pignut, animal liver, meat, eggs and vegetables. can be found in soy bean products, grain, eggs and meat. Vitamin C can be found in hawthorn, strawberry rapeseed plant and tomatoes.

However, some experts think that vegetables and fruits can not take the place of vitamin replenishers, such as vitamin C. Not all the vegetables contain vitamin C. -soluble vitamin C can be easily lost when the vegetables are washed. It can also be lost in high temperature during the cooking process. In addition, it can even be oxidized in the air. Sometimes, more than 90% of vitamin C can be lost. It is known to all that the adequate intake of vegetables and fruits is beneficial to the nutritional supplementation. However, the supplementation in this way is not adequate to maintain the health of the human body. At the same time, high pressure in life and work can also consume the vitamins to some degrees. The experts agree that it is necessary for the aged to supplement vitamins and trace elements by taking the replenishers. Therefore, the aged can supplement vitamins by taking the replenishers in a moderate amount.

The two principles of balanced diet and moderate drugs mentioned above should be followed by people carefully in daily life. The aged can not absorb enough vitamins until they grasp right skills. In addition, it is necessary for people to seek for suitable ways of nutritional supplementation in different seasons.