If what you mean by starch, is carbohydrates, then it turns to sugar in the body, which acts as an energy boost that is short lived. If you are diabetic it is best to stay away carbohydrates in large amounts as this will cause your blood sugar to rise and fall in extremes. Not good for us.
This is a very simplistic answer, and largely inaccurate Carbohydrates do turn into blood glucose (or sugar), but this is not always 'short lived.' If you are diabetic you do need to be careful which carbohydrates you eat, but there are many that have a very small effect on your blood sugar levels. There are many factors that determine what effect a carbohydrate food has on your blood sugar levels (and as a result your insulin levels), and the best way to find out which to eat is to consult the Glycemic Index data base at ww.glycemicindex.com. This compares carbohydrate foods against that of pure glucose on the effect on blood sugar. There is also more information on the glycemic index and what it means.
It is true to say that starch is a type of carbohydrate, and comes from plants. It is their energy store' and thus when we consume it we can obtain the energy from it. Starch is generally a relatively complex carbohydrate and though this does not always mean they have a small effect on blood sugar (for example potatoes cause a large increase in blood sugar levels), plant sources carbohydrate are generally more preferable as energy sources.
The digestion of starch starts in the mouth with the action of salivary amylase. Salivary amylase breaks down starch into simpler sugars like maltose. This partially digested starch then continues to be broken down in the small intestine by pancreatic amylase.
Oatmeal
Starch is digested by ptyalin.
Starch (carbohydrates) is broken down (digested) to maltose by salivary amylase.
Starch is a type of complex carbohydrate that is digested in a long process. Starch will be broken down into glucose (sugar). The glucose would thus provide energy for the body.
Amylase in an enzyme which is also a biological catalyst which reduces the activation energy needed for the hyrolysis of starch
In the small intestine
Digested.
Protein digestion primarily occurs in the stomach and small intestine of the human body.
Amylose starch is a type of starch that is broken down by enzymes in the body to release glucose molecules. These glucose molecules are then absorbed into the bloodstream to provide energy for the body. Amylose starch plays a key role in the process of starch digestion and absorption in the human body by providing a source of energy for cells.
from the breakdown of starch
Starch! We have amylases to digest them!!