Many of the studies used in this review had weaknesses, like not fully accounting for factors like weight or family history of diabetes, which means we should be cautious about trusting the results too much.

This study looked at six smaller studies and found only one type of vegetable (green leafy ones) might help prevent diabetes, while fruits and other veggies didn’t show clear benefits—this suggests the overall evidence isn’t very strong or consistent, which matches the claim that the studies weren’t all high quality.