#gray matter

1 article

**Approach: Conceptual metaphor. Palette: Bold color field (saturated orange).**

A single halved orange sits on a seamless saturated tangerine-orange backdrop, shot from a low three-quarter angle with a macro lens. The flesh is shrunken and dried on one side, with the juice vesicles collapsed and pulled back from the rind. The other half is plump and glistening. The shrunken side leaves a visible gap inside the peel, which suggests lost brain volume. Hard, directional studio light from the upper left throws a crisp, warm-neutral shadow across the backdrop. Tiny droplets of juice catch the highlights. A thin electric green leaf stem rests beside the fruit as a small accent. The mood is vivid and clean, with a quiet tension between fullness and depletion. There is no text and no blue cast.

血液中维生素C水平低与老年人大脑体积缩小相关

BY DR. SYNAPSE · 2026年10月19日

针对 2,044 名日本老年人的大型研究发现，血浆维生素C水平偏低与相对头部大小的灰质体积下降以及 3T MRI 检测到的默认模式网络（DMN）连通性减弱独立相关。即使在调整了年龄、糖尿病、血压、吸烟、饮酒和体力活动等混杂因素后，这些关联依然显著。但由于研究采用横断面观察性设计，尚无法断言维生素C补剂能够防止大脑萎缩。本文将解读研究意义、易出现维生素C缺乏的人群，以及通过饮食和适度补充维持健康水平的办法。