Diabetes mellitus occurs when the pancreas doesn't make enough or any of the hormone insulin, or when the insulin produced doesn't work effectively. In diabetes, this causes the level of glucose in the blood to be too high.
In Type 1 diabetes the cells in the pancreas that make insulin are destroyed, causing a severe lack of insulin. This is thought to be the result of the body attacking and destroying its own cells in the pancreas - known as an autoimmune reaction.
It's not clear why this happens, but a number of explanations and possible triggers of this reaction have been proposed. These include:
- infection with a specific virus or bacteria;
- exposure to food-borne chemical toxins; and
- exposure as a very young infant to cow's milk, where an as yet unidentified component of this triggers the autoimmune reaction in the body.
However, these are only hypotheses and are by no means proven causes.
Type 2 diabetes is believed to develop when:
- the receptors on cells in the body that normally respond to the action of insulin fail to be stimulated by it - this is known as insulin resistance. In response to this more insulin may be produced, and this over-production exhausts the insulin-manufacturing cells in the pancreas;
- there is simply insufficient insulin available; and
- the insulin that is available may be abnormal and therefore doesn't work properly.
The following risk factors increase the chances of someone developing Type 2 diabetes:
- Increasing age;
- obesity; and
- physical inactivity.
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