Most studies asked people to remember what they ate over time, which isn’t very accurate—so the real link between leafy greens and diabetes might be even stronger than what was found.

Different studies used different ways to measure what people ate — some asked about food habits over a year, others just asked what they ate yesterday — which might make it harder to see real links between diet and heart disease.

Blood tests for fruit and vegetable nutrients are better at predicting diabetes risk than asking people what they ate, because people often misremember or misreport their diet.

People with type 2 diabetes who eat less healthy foods are more likely to be overweight or have high blood sugar than those who eat healthier.

People with type 2 diabetes who eat less healthy foods are more likely to be overweight or have high blood sugar than those who eat healthier.

The worse someone with type 2 diabetes eats, the more likely they are to have multiple health problems—this pattern holds even between small differences in diet quality.