#cerebral blood flow

2 articles

Approach: conceptual metaphor. Palette: D, bold color field.

A single AA-style cylindrical battery stands upright, fully charged, on a seamless saturated mustard-yellow backdrop. Beside it sits a matching, untouched, slightly dusty glass jar of marbles, so the charge shows no visible link to any result. More precisely, a bright tomato-red extension cord plugs into the battery's top. Its other end curls away unconnected, lying on the floor beside an unlit incandescent bulb. A small electric green LED glows on the battery's side as the only green accent. Camera: low three-quarter angle, 50mm lens, shallow depth of field, with the bulb softly blurred in the foreground. Lighting: hard, clean studio key light from the upper left, with crisp shadows falling to the right on the yellow surface. Mood: puzzled, wry, a full power source that fails to light anything.

烟酰胺核苷令 NAD+ 翻倍，却未改善记忆

BY NOVA CHEN · 2026年10月27日

一种补充剂让血液中的关键分子水平翻了一番，但记忆没有任何改善。12 周的随机对照试验在轻度认知障碍（aMCI）老年人中进行，结果显示烟酰胺核苷（NR）将 NAD+ 提高了两倍，却未带来认知、整体脑血流或血压的变化。唯一稍显兴趣的是探索性分析中出现的海马区血流增高提示，但这远不足以构成证据。下面我们来看看这项研究到底说明了什么、存在哪些局限，以及如果你正考虑购买 NAD+ 提升剂该如何看待。

**Approach: Macro science. Palette: D, bold color field (deep magenta).**

An extreme close-up photograph of a real spermidine crystalline powder deposit, pale ivory needle-like crystals fanning out in clustered rosettes, shot with a macro lens at a shallow 30-degree overhead angle. The crystals sit on a smooth, saturated magenta acrylic surface that fills the whole frame. Soft, directional studio light from the upper left creates crisp highlights along the crystal edges, translucent glints inside the needles, and short, clean shadows on the magenta. Depth of field is razor-thin, so the front cluster is sharp and the background dissolves into creamy pink bokeh. One tiny crystal tip catches a faint electric green reflection. The mood is precise, curious and quietly skeptical, like a specimen under evaluation. No text, no labels, no hands.

supplements

一年精胺使前扣带血流提升，却未改善记忆

BY DR. SYNAPSE · 2026年10月26日

一项为期 12 个月、每日摄入 0.9 mg 精胺的随机对照试验在主观认知下降的老年人中发现，接受精胺的受试者前扣带血流量显著高于安慰剂组，且扣带回白质微结构保持更为稳定。然而，对 75 名 SmartAge 参与者的 MRI 探索性分析显示，脑容积、皮层厚度和白质高信号均未出现差异。更关键的是，这些影像学变化与记忆表现无关联，主试验本身也未观察到记忆提升。下面我们一起看看这些信号可能意味着什么、不能说明什么，以及剂量和食物来源的实用细节。