Sugar-cored apples are produced when apples get watery heart disease. Watery heart disease is a physiological disease of fruit trees that causes sugar to build up in apples, shortening their shelf life and making them susceptible to internal browning or rotting in the later stages of storage. Therefore, candy heart apples should be consumed as soon as possible. The nutritional value of candy-core apples is not much different from other apples, and they are not harmful to the human body.

It should be noted that "candy" apples are not necessarily sweeter than other apples. Apple crispness is different, mainly different varieties, intercellular adhesion between the degree and rate of decline caused by different. Generally speaking, after the late fall temperature difference between hot and cold temperatures and cold dew attack of the apple, as well as a golden yellow fruit surface and red vertical stripes of the more crisp and sweet.

Expanded Information

Sugar apple product characteristics:

1, fruit surface: the fruit surface of the Kali fruit is smooth and delicate, and the fruit points are faintly visible. Mainland red Fuji apple fruit surface rough, touch with the hand has obvious friction feeling.

2, bright color, slightly yellow. Mainland red Fuji color red, no luster.

3, the flesh is delicate, flesh color is slightly yellow, chewing the fruit taste rich, basically no residue. The mainland's flesh is loose, fruit flavor is light, not enough water, pale flesh.

4, the core is transparent, commonly known as "candy heart", is the difference between other origins of the red Fuji apple logo.

Baidu Encyclopedia - Sugar-cored Apples

People's Daily Online - Why Apples Have "Sugar Cores"