Mahoney and Loprinzi reported that higher intakes of flavonoid-rich fruits and vegetables were associated with significantly lower C-reactive protein (β = −0.005), HbA1C (β = −0.008), and glucose levels (β = −0.51), and 33% reduced odds of having diabetic retinopathy (OR = 0.67, 95% CI: 0.45–0.99; p = 0.04) [15]. This evidence concerns the gene CRP and diabetic retinopathy.