A new longevity study is quietly challenging one of nutrition’s most comfortable assumptions — but only if you miss the fine print. For decades, plant-based diets have been linked to lower risks of heart disease, diabetes, and obesity. But a recent analysis of more than 5,000 Chinese adults aged 80 found something unexpected: older adults who ate some meat were more likely to reach 100 than those who avoided it entirely. At first glance, it sounds like a reversal. But the real story is subtler a