Eating healthy and longevity?

Is there a study that determines that eating healthy can lead to a long life (90+ years old)? There has been a hype in eating healthy in the United States, I have been seeing "whole food" and "super food" popping up everywhere but I wonder if eating healthy really works. Looking back at my grandparents, when they were alive, all they ate was white rice, meat, and vegetables. They never ate blueberries, quinoa, or chia seeds yet they managed to maintain a healthy life up until their death (age 102).