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Carbohydrates are the source of most of the problems for people. Even an apple we consider is good, but eat too many apples and don’t balance it with anything else then the blood sugar levels can be on a roller-coaster eventually resulting in Diabetes Type II.
All carbohydates we eat will eventually become molecules of glucose, fructose and galactose. If we eat sugar it will very quickly bread down however a complex carbohydate has more than 10 molecules and takes longer to break down.
The big problem with carbohydrates is that when eaten without fat or protein they quickly get absorbed into the bloodstream causing the blood sugar levels to rise rapidly. The body responds by releasing insulin into the bloodstream to attempt to push the sugar into the cells. We cannot handle high sugar in our blood. Eventually the cells become resistant to the insulin and it becomes increasingly difficult to get the sugar out of the blood stream. This can affect the kidneys, our blood vessels particularly in the eyes.
It is really important to NOT eat carbohydrates by themselves. If having an apple, have a slice of cheese with it or a few nuts to slow that release of sugar into the blood stream. Eating high fibre is also a good way to slow it down. e.g. oat bran, lentils, seeds and vegetables.