The acid in apples is dominated by malic acid, and the content of other organic acids such as citric acid are not high. Organic acids are the sour substances in apples. The acid in apples has the effect of eliminating fatigue, improving appetite, promoting digestion, softening blood vessels, lowering blood cholesterol, etc. Malic acid and citric acid can also improve the body's absorption of calcium.

The vitamins in apples are mainly vitamin C, with a content of about 3 mg/100 grams. Vitamin C can enhance immunity, prevention and treatment of iron deficiency anemia, pernicious anemia and scurvy, promote collagen formation and steroid metabolism, maintain the normal function of bones and teeth and cell membrane integrity, lead compounds, arsenides, benzene, bacterial toxins, etc. have a detoxification effect, but also anti-aging. In addition to vitamin C, apples also contain thiamin, riboflavin, niacin, folic acid, pyridoxine and other vitamins. These vitamins are also very beneficial to human health.

Dietary fiber in apples includes soluble dietary fiber and insoluble dietary fiber in two categories.　Dietary fiber is the seventh human nutrient, can prevent and control overnutrition obesity, diabetes and hypertension, but also to prevent coronary heart disease, atherosclerosis, constipation and gallstones.

Expanded Information:

< p>Taboo one, eat apples don't chew apple core

Apple core contains a small amount of harmful substances - hydrocyanic acid. Hydrocyanic acid is deposited in the body in large quantities, which can lead to dizziness, headache, accelerated respiratory rate and other symptoms, and in severe cases, coma may occur. But there is no need to worry too much, the hydrocyanic acid in apples mainly exists in the core, and not in the flesh. Need to be reminded that: eating apples used to gnaw to the core, although it will not immediately lead to poisoning, but long-term so eat, it is not good for health.

Taboo two, beware of waxed apples

Many apples in the growth process, the excessive use of growth hormone, redness hormone, expansion hormone, or storage in the excessive use of preservatives, and even the sale of coloring agents, waxing, bleaching and dyeing, etc., so as to meet the consumer "appearance of the fruit" of the psychological, these toxic! These toxic fruits have become a serious threat to people's health of public health. The danger of "toxic apples": bulking hormone to promote the individual, reddish pigment to increase color, preservatives to keep fresh. Excessive use of bulking hormone, reddish pigment, preservatives can damage the liver. Retail fruit vendors will also give the apple with industrial paraffin, the purpose is to maintain moisture, is the body of the fruit bright and attractive.

Reference:

People's Daily Online - How to correctly recognize the nutritional value of apples? Experts to tell you