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I've posted variations on this in various threads, but since questions come up regularly(and I worked hard on it) I thought it might be useful to have it under its own header.
[u]Here goes Carbs101[/u]
A carbohydrate is a molecule made up of atoms of carbon, hydrogen and oxygen bonded chemically. The proportion of hydrogen to Oxygen is usually, but not always 2:1. Among the simplest carbohydrates are the simple sugars, or monosaccharides. They have a carbon chain spine, which often forms a ring, with hydrogen and a group which is the “free sugar" group attached. Simple sugars with carbon chains of from 2 to 10 carbon atoms are known. If 2 monosaccharides are chemically bonded together, a disaccharide is formed. thus Glucose and fructose, with a 6 carbon and a 5 carbon ring respectively, both monosaccharides combine to form sucrose, a disaccharide. Polymers of many monosaccharide units include, starch and cellulose.
The only carbohydrates of importance in the diabetic diet are those based on, or easily converted to glucose. This does not include fructose. Fructose is Very sweet and tastes nice, but tends to encourage formation of triglycerides in the liver. This is a pity.
For every molecule of Sucrose (table sugar) you consume, only half becomes blood glucose.. The other half is fructose and is metabolised along different pathways. However, for every molecule of starch you consume, 100% becomes blood glucose. Thus effectively, starch is worse for blood glucose levels than table sugar, weight for weight.
The so-called complex carbs, tend to be made up of starches and some cellulose (which is also a carb, but not digestible)
A whole heap of cellulose, otherwise known as dietary fibre, won't raise your BG, but a whole load of starch WILL.
To make remembering all this more difficult, there are 2 kinds of starch chains, Amylose and amylopectin.
Amylose is formed of straight chains, which coil up tightly and resist cooking
Amylopectin is formed of branched chains, which are loosely wound.
We don’t have a mechanism for digesting starch in the raw state, it must be cooked first. So starches containing a lot of amylose in the mix are slower to digest, the so called low GI starches.
Although, amylose will be broken down 100% into glucose, it happen slowly.
Typical starches contain about 20% amylose and 80% amylopectin. Starches from different plant sources vary somewhat.
Unless you want to study biochemistry, a good way to remember which carbs to eat, is Sugar goes 50% to BG FAST
Starch goes 100% to BG Slower.
The only truly GOOD carb for a diabetic is Cellulose, which we can’t digest at all. It’s dietary fibre, or roughage and keeps the gut working, giving it something to push on.l
[u]Here goes Carbs101[/u]
A carbohydrate is a molecule made up of atoms of carbon, hydrogen and oxygen bonded chemically. The proportion of hydrogen to Oxygen is usually, but not always 2:1. Among the simplest carbohydrates are the simple sugars, or monosaccharides. They have a carbon chain spine, which often forms a ring, with hydrogen and a group which is the “free sugar" group attached. Simple sugars with carbon chains of from 2 to 10 carbon atoms are known. If 2 monosaccharides are chemically bonded together, a disaccharide is formed. thus Glucose and fructose, with a 6 carbon and a 5 carbon ring respectively, both monosaccharides combine to form sucrose, a disaccharide. Polymers of many monosaccharide units include, starch and cellulose.
The only carbohydrates of importance in the diabetic diet are those based on, or easily converted to glucose. This does not include fructose. Fructose is Very sweet and tastes nice, but tends to encourage formation of triglycerides in the liver. This is a pity.
For every molecule of Sucrose (table sugar) you consume, only half becomes blood glucose.. The other half is fructose and is metabolised along different pathways. However, for every molecule of starch you consume, 100% becomes blood glucose. Thus effectively, starch is worse for blood glucose levels than table sugar, weight for weight.
The so-called complex carbs, tend to be made up of starches and some cellulose (which is also a carb, but not digestible)
A whole heap of cellulose, otherwise known as dietary fibre, won't raise your BG, but a whole load of starch WILL.
To make remembering all this more difficult, there are 2 kinds of starch chains, Amylose and amylopectin.
Amylose is formed of straight chains, which coil up tightly and resist cooking
Amylopectin is formed of branched chains, which are loosely wound.
We don’t have a mechanism for digesting starch in the raw state, it must be cooked first. So starches containing a lot of amylose in the mix are slower to digest, the so called low GI starches.
Although, amylose will be broken down 100% into glucose, it happen slowly.
Typical starches contain about 20% amylose and 80% amylopectin. Starches from different plant sources vary somewhat.
Unless you want to study biochemistry, a good way to remember which carbs to eat, is Sugar goes 50% to BG FAST
Starch goes 100% to BG Slower.
The only truly GOOD carb for a diabetic is Cellulose, which we can’t digest at all. It’s dietary fibre, or roughage and keeps the gut working, giving it something to push on.l