Below are some studies that show an association between eating eggs and risk for type 2 diabetes (and gestational diabetes). Since there is a dose-response relationship – the more eggs you eat the greater your risk for diabetes – I’m going to guess that people who eat just a few eggs a week risk prediabetes, or high blood glucose just short of being diagnosed with type 2 diabetes.
This review of 14 studies showed that those who consumed the most eggs increased their risk for diabetes by 68%. If they already had diabetes, they increased their risk for cardiovascular disease by 83%.
Egg Consumption And Risk Of Cardiovascular Diseases And Diabetes: A Meta-Analysis, Atherosclerosis, August 2013
Results: Fourteen studies involving 320,778 subjects were included. The pooled RRs of the risk of CVD, CVD for separated diabetes patients, and diabetes for the highest vs lowest egg intake were 1.19 (95% CI 1.02-1.38), 1.83 (95% CI 1.42-2.37), 1.68 (95% CI 1.41-2.00), respectively.
Conclusions: Our study suggests that there is a dose-response positive association between egg consumption and the risk of CVD and diabetes.
Another review found a 39% higher risk of diabetes in people who ate three or more eggs per week.
Egg Consumption And Risk Of Type 2 Diabetes: A Meta-Analysis Of Prospective Studies, American Journal of Clinical Nutrition, February 2016.
Results: We identified 12 cohorts for a total of 219,979 subjects and 8911 cases of DM. … When stratified by geographic area, there was a 39% higher risk of DM (95% CI: 21%, 60%) comparing highest with lowest egg consumption in US studies. … Elevated risk of DM was observed in US studies among people consuming ≥3 eggs/wk.
Egg consumption also increases the risk for gestational diabetes:
Risk of Gestational Diabetes Mellitus in Relation to Maternal Egg and Cholesterol Intake, American Journal of Epidemiology, March 2011
Women who consumed the most eggs (7 or more eggs per week) had a 77% increased risk of diabetes in one study [Omega] and a 165% increased risk in another study [Alpha], compared with those who consumed the least.
Higher egg and cholesterol intakes are associated with increased risk of type 2 diabetes mellitus. However, their association with gestational diabetes mellitus (GDM) has not been evaluated. The authors assessed such associations in both a prospective cohort study (The Omega Study, 1996–2008; 3,158 participants) and a case-control study (The Alpha Study, 1998–2002; 185 cases, 411 controls).
[n The Omega Study], women with high egg consumption (≥7/week) had a 1.77-fold increased risk compared with women with lower consumption (95% confidence interval (CI): 1.19, 2.63). The relative risk for the highest quartile of cholesterol intake (≥294 mg/day) versus the lowest (<151 mg/day) was 2.35 (95% CI: 1.35, 4.09).
In the [Alpha] case-control study, the adjusted odds ratio for consuming ≥7 eggs/week versus <7 eggs/week was 2.65 (95% CI: 1.48, 4.72), and the odds of GDM increased with increasing cholesterol intake (P for trend = 0.021).
In conclusion, high egg and cholesterol intakes before and during pregnancy are associated with increased risk of GDM.