Researchers have been able to observe people developing Type 2 diabetes - and confirmed that fat over-spills from the liver into the pancreas, triggering the chronic condition.
"We saw that when a person accumulates too much fat, which should be stored under the skin, then it has to go elsewhere in the body. The amount that can be stored under the skin varies from person to person, indicating a 'personal fat threshold' above which fat can cause mischief, said study lead author Roy Taylor from Newcastle University in UK.
The study, published in the journal Cell Metabolism, involved a group of people from Tyneside, who previously had Type 2 diabetes but had lost weight and successfully reversed the condition as part of the DiRECT trial, which was funded by Diabetes UK.
After two years, more than one third of the group had been free of diabetes and off all diabetes medication for at least two years.
Although the majority remained non-diabetic for the rest of the two year study, however, a small group went on to regain weight and re-developed Type 2 diabetes.
"When fat cannot be safely stored under the skin, it is then stored inside the liver, and over-spills to the rest of the body including the pancreas. This 'clogs up' the pancreas, switching off the genes which direct how insulin should effectively be produced, and this causes Type 2 diabetes," Taylor said.
According to the researchers, this study confirms that Type 2 diabetes is caused by excess fat actually within both the liver and pancreas, and especially that this process is reversible.
This new study builds on previous Newcastle research supported by Diabetes UK showing exactly why Type 2 diabetes can be reversed back to normal glucose control.
Those studies led to the large DiRECT trial which showed that primary care staff can achieve remission of Type 2 diabetes by using a low calorie diet with support to maintain the weight loss.
A quarter of participants achieved a staggering 15 kg or more weight loss, and of these, almost nine out of 10 people put their Type 2 diabetes into remission.
"This means we can now see Type 2 diabetes as a simple condition where the individual has accumulated more fat than they can cope with," Taylor said.
"Importantly this means that through diet and persistence, patients are able to lose the fat and potentially reverse their diabetes. The sooner this is done after diagnosis, the more likely it is that remission can be achieved," Taylor added.
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