Sugars, such as starch contained in food, decompose into glucose and become absorbed into the blood. When we are healthy, the concentration of glucose, known as blood sugar level, is controlled and kept under a certain level. However, if we become unable to regulate the level of glucose and blood sugar levels increase, we become glucose intolerant. This is called diabetes and is a very dangerous life-style related disease.

Starch, which we consume in our daily diet, is broken down into smaller units by enzymes and then absorbed by the small intestine.
Undoubtedly, excess sugar intake is dangerous. Tea catechins work to suppress the decomposition enzyme, so the starch is not broken down so much and absorption is moderate. Accordingly, an increase in blood sugar is suppressed.

*Starch…compounds lining up in chains
*Sucrose…commonly called sugar, main component of sweets