A small Weill Cornell study gave people with type 2 diabetes the exact same meal on different days — the only change was order. When they ate the vegetables and protein first and the carbs last, their post-meal blood sugar and insulin were meaningfully lower than when they ate the carbs first. Follow-up studies have pointed the same way.
The likely reason: fiber and protein slow how fast your stomach empties, so the carbs arrive gradually instead of all at once. It's one of the lowest-effort habits in nutrition — start with the salad or veg, save the bread or rice for later in the meal. Worth knowing: the studies are small and the science is young, so treat it as a free, low-risk upgrade rather than a magic trick. Nothing gets banned; the plate just gets reordered.