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Note that both eggs and high-fat dairy products were basically considered evil by the medical establishment for many years. Remember egg white omelettes?And now both are thought to have health benefits, especially reducing the risk of diabetes. From Science Daily:

Eating eggs reduces risk of type 2 diabetes, study indicates

Egg consumption may reduce the risk of type 2 diabetes, according to new research...Research has shown that lifestyle habits, such as exercise and nutrition, play a crucial role in the development of the disease. A new study has found that egg consumption was associated with a lower risk of type 2 diabetes as well as with lower blood glucose levels. Men who ate approximately four eggs per week had a 37 per cent lower risk of type 2 diabetes than men who only ate approximately one egg per week. This association persisted even after possible confounding factors such as physical activity, body mass index, smoking and consumption of fruits and vegetables were taken into consideration. The consumption of more than four eggs did not bring any significant additional benefits.

The dietary habits of 2,332 men aged between 42 and 60 years were assessed at the baseline of the Kuopio Ischaemic Heart Disease Risk Factor Study, KIHD, at the University of Eastern Finland in 1984-1989. During a follow-up of 19.3 years, 432 men were diagnosed with type 2 diabetes.

Also note that high meat consumption is linked to higher risk of diabetes. From Science Daily:

High-fat dairy products linked to reduced type 2 diabetes risk

Consumption of high-fat yoghurt and cheese are linked to a reduction in the risk of type 2 diabetes by as much as a fifth, according to new research. High meat consumption, on the other hand, is linked to a higher risk.

However, the new study indicates that it is high-fat dairy products specifically that are associated with reduced risk."Those who ate the most high-fat dairy products had a 23 per cent lower risk of developing type 2 diabetes than those who ate the least. High meat consumption was linked to an increased risk of type 2 diabetes regardless of the fat content of the meat," said Ulrika Ericson, who conducted the study.

The researchers studied the eating habits of 27,000 individuals aged 45 to 74. The participants took part in the Malmö Diet and Cancer study in the early 1990s, in which they provided details of their eating habits. Twenty years on, over ten per cent -- 2 860 people -- had developed type 2 diabetes.

These results go against the medical advice we've been hearing for years (why am I not surprised?). The new advice: High-fat dairy  yes, low-fat dairy no. I also think processed meat (with nitrates) should not be lumped together with unprocessed meat. From Science Daily:

Consumption of high-fat dairy products associated with lower risk of developing diabetes

People with the highest consumption of high-fat dairy products -- eight or more portions per day -- have a 23 percent lower risk of developing type 2 diabetes (T2D) than those with the lowest consumption -- one or less per day, a new study shows.

The study included 26 930 individuals (60% women), aged 45-74 years, from the population-based Malmö Diet and Cancer cohort. Dietary data was collected with a modified diet history method. During 14 years of follow up, 2860 incident T2D cases were identified. 

The researchers found that high intake of high-fat dairy products was associated with a 23% lower incidence of T2D for the highest consuming 20% of participants (or quintile) (median=8 portions/day) compared with the lowest consuming 20% (median=1 portion/day).

In contrast to these findings, there was no association found between intakes of low-fat dairy products and risk of developing type 2 diabetes.

High intakes of meat and meat products were, regardless of fat content, associated with increased risk, but the increased risk was higher for lower fat meats (increased risk of type 2 diabetes for high fat meats 9%, for low fat 24%), both referring to the risk in the highest-consuming versus lowest-consuming 20%). The highest consuming group for the high-fat meat had 90g or more per day, and for the low-fat meat 80g per day.

Same research, some extra details in write-up. From Medscape:

Big Intake of High-Fat Dairy May Be Protective for Diabetes

Previous research led by Nita Forouhi, MD, program leader and public-health physician at the MRC Epidemiology Unit, University of Cambridge, United Kingdom, published in August this year, suggested that molecules with odd numbers of carbon atoms (15 and 17), which are found in dairy products such as yogurt, cheese, and milk, appeared to have a protective effect.

This contrasts with evidence suggesting that even-chain saturated fatty acids, as found in alcohol or margarine, are associated with a greater risk for type 2 diabetes.