Food · Misleading · 营销标签
Superfoods
超级食物没有科学定义 · 欧盟 2007 年禁止无据健康声称 · ORAC 数据库被 USDA 于 2012 年撤回 · 饮食多样性胜过任何单一明星食物 · 蓝莓等固然优质，但没有魔法
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Story path
- 1The claim · superfoods cure everythingThe claim · superfoods cure everything
- 2Where the label came fromWhere the label came from
- 3Mechanism truth · the rise and fall of ORACMechanism truth · the rise and fall of ORAC
- 4Evidence grade · the gap between observation and RCTEvidence grade · the gap between observation and RCT
- 5Grain of truth · the foods themselves are fineGrain of truth · the foods themselves are fine
- 6What to actually do · variety beats any single starWhat to actually do · variety beats any single star
Chapter 1
The claim · superfoods cure everything
The claim · superfoods cure everything
Walk into any health food store and you will see the word: 'superfood'. Açaí, goji, maca, chia, spirulina — they are packaged as silver bullets against oxidative stress, inflammation, cancer, and aging, sold at prices several to more than ten times that of ordinary foods.
Typical marketing language sounds like: 'contains X times more antioxidants than blueberries', 'rich in rare phytochemicals that activate cellular self-repair', 'clinically proven to reverse oxidative damage'. Every few years a new superfood appears, propelled by celebrity endorsements and social media waves.
This scene's job is to pull the marketing category apart: what is its evidence base, what does 'super' actually mean, and what is the real cost of consumer buy-in.
Typical marketing language sounds like: 'contains X times more antioxidants than blueberries', 'rich in rare phytochemicals that activate cellular self-repair', 'clinically proven to reverse oxidative damage'. Every few years a new superfood appears, propelled by celebrity endorsements and social media waves.
This scene's job is to pull the marketing category apart: what is its evidence base, what does 'super' actually mean, and what is the real cost of consumer buy-in.
机制 · 含量、吸收量、到达量, 是三个不同的数
营销文案里那个数字，量的是一克食物里有多少。你真正关心的是另一个数：最后有多少分子，站到了它该起作用的那个位置上。这两个数中间要过四道关，每一道都会掉一大截。第一个数是含量。 在实验室里把食物磨碎、萃取，测出每克里有多少某种分子。这一步跟身体没有关系，它量的是这袋粉。
第二个数是吸收量。 你把它吃下去，它得先穿过小肠壁。肠壁不是筛子，是一层活细胞紧挨着排成的墙，只有形状和油水性质合适的分子才被放行。多酚这一类分子普遍个头大、还挂着糖，这道墙对它们极不友好，绝大部分根本没进来，顺着肠道继续往下走了。
第三个数是血里留下的量。 就算进来了，从肠壁到肝脏这一路，细胞会立刻给它挂上一个水溶性的标签。这是身体处理外来分子的标准动作，目的很直接：让它溶得进尿，好被肾脏送走。挂完标签的分子，已经不完全是你吃下去的那一个，血里的浓度也掉得很快。
第四个数是真正到达的量。 血里剩下的那点，还要分散到全身各处的组织里去，才轮到它在某个细胞旁边做点什么。
四道关走完，一个在实验室里很漂亮的含量，落到身体里往往只剩极小一部分，而且形态已经变了。超级食物的营销几乎全部停在第一个数上——因为只有第一个数是它能控制、也能印在包装上的。
数字 · X 倍于蓝莓 是怎么算出来的
X 倍于蓝莓这句话，几乎总是按每克比出来的，而且比的是干粉和新鲜水果。新鲜蓝莓里绝大部分是水。把它冻干、磨成粉，水没了，同样的东西被压进更少的克数里——于是每克含量这个数字自动往上跳一大截。这一步纯粹是把水拿走，跟这种植物有什么本事完全无关。你要是把新鲜蓝莓也冻干成粉再去比，差距立刻缩水一大截。
第二个问题是：这两样东西你根本不会按同样的克数吃。一小勺粉和一整碗蓝莓，重量差很远。按每克比出来的倍数，落到一次吃一份上就没有意义了。
第三个问题最要命，下一站会展开：这个所谓的抗氧化物含量本身，是在试管里量出来的化学数字，不是在人身上量出来的效果。
三个问题叠在一起，X 倍这句话就只剩下一件事是真的——它确实是个数字。
Chapter 2
Where the label came from
Where the label came from
'Superfood' does not appear in any medical textbook or in the official vocabulary of any regulatory body. It is purely a marketing term.
Its commercial origins trace to the 1990s American health food market. Marketers found that 'this food is rich in antioxidants' dramatically expanded premium pricing. That logic gave birth to the 'superfood' category label — named by a marketing department, not by scientists.
In 2007 the EU passed the Nutrition and Health Claims Regulation (EC 1924/2006), requiring any health claim to pass EFSA review and be backed by adequate clinical evidence; prior superfood marketing in EU markets became effectively non-compliant. That regulatory action is itself revealing: regulators intervened precisely because the word was being used to make health promises it could not keep.
In Chinese-language markets 'superfood' has no specific regulation, leaving consumers with weaker protection, higher premiums, and more extravagant marketing claims.
Its commercial origins trace to the 1990s American health food market. Marketers found that 'this food is rich in antioxidants' dramatically expanded premium pricing. That logic gave birth to the 'superfood' category label — named by a marketing department, not by scientists.
In 2007 the EU passed the Nutrition and Health Claims Regulation (EC 1924/2006), requiring any health claim to pass EFSA review and be backed by adequate clinical evidence; prior superfood marketing in EU markets became effectively non-compliant. That regulatory action is itself revealing: regulators intervened precisely because the word was being used to make health promises it could not keep.
In Chinese-language markets 'superfood' has no specific regulation, leaving consumers with weaker protection, higher premiums, and more extravagant marketing claims.
规则 · 欧盟和中文市场的差别
在欧盟，任何健康声称都必须有充分临床证据并经 EFSA 审查 (《食品营养和健康声称法规》EC 1924/2006)，无据的superfood营销因此在欧盟市场站不住脚。中文市场里超级食物没有被专项监管，消费者的保护程度因此更低，溢价更高，营销话术也更为夸张。
对买东西的人来说，这条差别的实际含义只有一句：包装上那句话有没有被人查过，取决于它在哪里印的，而不取决于它对不对。所以你不能把它敢这么写当成它有依据。判断标准得自己建一套，接下来几站给的就是这套标准。
误区 · 为什么被选中的正好是抗氧化这个词
为什么撑起这个类别的是抗氧化，而不是别的词？因为它没有对应的体感。泻药有没有用，几小时之内你自己就知道；止痛药有没有用，半小时就知道。而氧化是细胞层面每时每刻都在进行的化学过程，你感觉不到它，也没有任何一个家用办法能量它。一句帮你抗氧化，买的人既证实不了，也证伪不了。
证伪不了的宣称，对卖方来说近乎完美：它永远不会被退货。这就是为什么这个词能撑起一整个类别，而帮你补充膳食纤维只能撑起一包麦片——后者对应的是肠道里一件具体、可感、几天之内你自己就能验证的事。
要说清楚的是，这里说的不是氧化不存在，也不是多酚不重要。氧化确实在发生，多酚也确实是植物里真实存在的一类分子。有问题的是那条推理链：从试管里这个分子能中和自由基，一步跳到所以你吃了会更健康。这条链中间缺了好几环，接下来两站一环一环补上。
Chapter 3
Mechanism truth · the rise and fall of ORAC
Mechanism truth · the rise and fall of ORAC
The main scientific support for 'superfood' claims rested on a metric called ORAC — Oxygen Radical Absorbance Capacity. In the 1990s, a USDA laboratory developed the ORAC assay, and a ranked list of foods by ORAC value became the bible of superfood marketing: whichever berry scored higher was deemed more 'super'.
In 2012, the USDA Agricultural Research Service officially withdrew the entire ORAC database and published an explanatory statement. The reason: ORAC values are in vitro measurements taken in a test tube; antioxidants from food are digested, metabolized, and bound to other molecules inside the human body, where their actual antioxidant effect is completely different from the test tube; more critically, no reliable human evidence supported the chain: 'eating high-ORAC foods → higher blood antioxidant capacity → improved health outcomes'.
In other words, the core scientific basis of superfood marketing was repudiated by the very institution that produced the original data. Antioxidant bioavailability, in-body metabolic pathways, and ultimate health effects are far more complex than a test tube number. For the actual evidence on antioxidant mechanisms, see the astaxanthin and vitamin-c stories.
In 2012, the USDA Agricultural Research Service officially withdrew the entire ORAC database and published an explanatory statement. The reason: ORAC values are in vitro measurements taken in a test tube; antioxidants from food are digested, metabolized, and bound to other molecules inside the human body, where their actual antioxidant effect is completely different from the test tube; more critically, no reliable human evidence supported the chain: 'eating high-ORAC foods → higher blood antioxidant capacity → improved health outcomes'.
In other words, the core scientific basis of superfood marketing was repudiated by the very institution that produced the original data. Antioxidant bioavailability, in-body metabolic pathways, and ultimate health effects are far more complex than a test tube number. For the actual evidence on antioxidant mechanisms, see the astaxanthin and vitamin-c stories.
机制 · 试管里那一下, 到底测了什么
ORAC 的测法本身很直白，理解了它，也就理解了它为什么搬不到人身上。试管里放三样东西：一个会发荧光的分子、一个不停制造自由基的发生器，以及你要测的那份食物萃取液。自由基去攻击那个荧光分子，把它打坏，荧光就一点点暗下去。如果萃取液里的分子能抢先跟自由基反应，荧光就熄得慢一些。仪器记录的就是荧光多撑了多久，换算出来的数就是 ORAC 值。
现在看看这个装置里没有什么：没有嘴，没有胃酸，没有肠壁，没有肝脏，没有肾脏，没有血液，也没有一个活细胞。萃取液是被直接倒到自由基旁边的——它不需要被吸收，不需要躲过任何一道改造，也不需要走到任何地方去。
所以 ORAC 量的其实是一个纯化学问题：这份萃取液里的分子，跟自由基反应得快不快。这个问题有答案，答案也是真的。它只是跟你吃下去会怎样不是同一个问题。营销把两者当成了同一个问题，断点就在这里。
还有一层常被忽略：榜单是按每克排的，而榜上很多高分选手是香料和干粉，那是你一次只会用一小撮的东西。一个每克得分很高但你一次只吃一小撮的东西，和一个得分中等但你能吃满满一碗的东西，谁在一天里贡献得多，榜单不回答这个问题。
机制 · 同一个分子吃下去之后走的那条路
把试管里那份萃取液换成一口真的蓝莓，跟着它走一遍。它长什么样。 让浆果发紫发黑的那类分子叫花青素 (anthocyanin)，结构上是一个色素骨架挂着一个糖。这个组合又大又亲水，恰好是最不容易穿过肠壁的那一类形状。
第一道关，小肠。 肠壁是一层活细胞紧密排成的墙。脂溶性的小分子能溶进细胞膜那层油里直接穿过去，而花青素这种又大又带糖的分子过不去，只能靠数量有限的转运蛋白捎带一点。结果是绝大部分根本没被吸收，顺着肠道继续往下走。
第二道关，结肠里的细菌。 没被吸收的那一大部分到了大肠，肠道细菌把它的环拆开，剪成一堆更小的酚酸类碎片。也就是说，此时血里可能出现的，已经不是蓝莓里原来那个分子，而是细菌的产物。
第三道关，挂标签。 少数被吸收进来的，在肠壁细胞和肝细胞里会立刻被挂上葡萄糖醛酸或者硫酸基这样的水溶性标签。这是身体对付所有外来分子的标准动作，目的很明确：让它溶得进尿，好被肾脏送走。挂上标签之后分子的形状变了，它跟受体或者酶结合的方式也跟着变了。
第四道关，肾脏。 水溶化之后，肾小球把它滤进尿里，血里的浓度掉得很快。
走完这四关，那个决定性的事实就出来了：试管里那杯萃取液的浓度，你的血液从来达不到；而血里真正在循环的那些分子，也不是试管里被测的那一个。一个数字要能从试管搬到人身上，前提是两边的东西一样、量也一样，而这里两个前提都不成立。
这条链还顺手解释了几件相邻的事：为什么整颗浆果和提取物胶囊不能划等号；为什么吃进去多少和血里有多少从来不是一个数；也为什么很多多酚类研究最后测的是尿里的代谢物——那才是身体正在处理它的凭据。
误区 · 就算真有好处, 也未必是抗氧化带来的
还有一层更釜底抽薪的问题：ORAC 就算测得准，可能也在测错的东西。对花青素这类分子研究得比较透的综述给出的判断是：它们在人体内吸收很差，而它们身上能观察到的作用，更像是信号分子，而不是清洁工。
这两个身份的区别很实在。清洁工的逻辑是数量：血里有多少个抗氧化分子，就能中和掉多少个自由基，越多越好，这正是 ORAC 隐含的模型。信号分子的逻辑是碰到谁：极少量的分子停在某个细胞上的一个特定位置，改变那个细胞接下来的行为，关键在于停对了地方，不在于来了多少个。
如果第二个身份更接近真相，那么整套按含量排名的做法从根上就错位了：你在按清洁工的人数给候选人排队，而实际干活的机制是有没有敲对门。含量高不等于敲对门，敲对门也不需要含量高。
这也是为什么这一站要放在证据之前。下一站会看到人体证据确实薄，但薄的原因不只是研究做得还不够多，也包括一开始量的就是一个跟结果关系不大的指标。
最后一句要说实在：这些分子究竟改变了细胞的哪些行为，目前的证据只到 C 级——机制上说得通，人体终点证据稀少。这一站给你的不是一个新答案，是一个更准的问法。
Chapter 4
Evidence grade · the gap between observation and RCT
Evidence grade · the gap between observation and RCT
So, do foods classified as 'superfoods' have genuinely strong clinical evidence?
The short answer: there is limited population-study evidence, mostly cohort studies, but no single 'superfood' has been proven in rigorous RCTs to prevent specific diseases or extend lifespan.
Take blueberry — one of the most thoroughly studied superfood candidates to date. Cohort data show a statistically significant association between frequent blueberry consumption and lower cardiovascular event risk (Cassidy 2013, Nurses' Health Study). But observational data cannot rule out confounding: people who eat blueberries frequently also tend to have better overall diets, higher incomes, and more exercise. Once other dietary factors are controlled, blueberry's 'independent effect' shrinks considerably and rarely translates to improved clinical endpoints in RCTs.
For açaí and goji, the situation is worse: most evidence comes from cell cultures or mouse experiments, with few well-designed human RCTs and no large long-term cohort data. The 'clinically proven' language in marketing typically refers to this lowest evidence tier of in vitro or animal data.
This is not to say these foods are harmful — they are all nutritionally decent whole foods. The problem is that 'super' promises health benefits far beyond the evidence base. Evidence grade: C (plausible mechanism, sparse human RCT evidence).
The short answer: there is limited population-study evidence, mostly cohort studies, but no single 'superfood' has been proven in rigorous RCTs to prevent specific diseases or extend lifespan.
Take blueberry — one of the most thoroughly studied superfood candidates to date. Cohort data show a statistically significant association between frequent blueberry consumption and lower cardiovascular event risk (Cassidy 2013, Nurses' Health Study). But observational data cannot rule out confounding: people who eat blueberries frequently also tend to have better overall diets, higher incomes, and more exercise. Once other dietary factors are controlled, blueberry's 'independent effect' shrinks considerably and rarely translates to improved clinical endpoints in RCTs.
For açaí and goji, the situation is worse: most evidence comes from cell cultures or mouse experiments, with few well-designed human RCTs and no large long-term cohort data. The 'clinically proven' language in marketing typically refers to this lowest evidence tier of in vitro or animal data.
This is not to say these foods are harmful — they are all nutritionally decent whole foods. The problem is that 'super' promises health benefits far beyond the evidence base. Evidence grade: C (plausible mechanism, sparse human RCT evidence).
证据 · 蓝莓这条线走到哪一步了
把蓝莓单独拉出来看，因为它是这批食物里唯一称得上有像样人群数据的。队列研究这一层。 在大规模长期跟踪的人群里，花青素摄入较高的人心血管事件确实更少 (护士健康研究)；另一条线索来自认知功能，浆果吃得多的人认知下降更慢。这类研究的价值在于时间够长、人数够多，看到的是真实生活里的结局。
它天生做不到的事。 队列研究不分配谁吃什么，只是记录人们本来吃什么。而本来就常吃浆果这件事，是和一整套生活方式绑在一起的：这群人通常蔬果吃得更多、超加工食品吃得更少、收入更高、体力活动更多，也更可能定期体检。统计上可以把已知因素扣掉，但只能扣掉你想到了并且测量了的那些。剩下的那部分叫残余混杂，没有办法彻底排除。
随机对照试验这一层。 把人随机分成两组，一组吃一组不吃，才能切断上面那条绑定。问题是这类试验通常规模小、周期短，测的是血管弹性、血压这类中间指标，而不是几年后有没有心梗这样的终点。中间指标动一点，和终点会不会变，中间还隔着很多年和很多环节。
所以现在的状态是这样。 能看到长期结局的研究证不了因果，能证因果的研究又不够长。这不是蓝莓独有的困境，几乎所有单一食物的研究都卡在同一个地方。它也解释了为什么证据等级 C 不是对蓝莓的贬低，而是对我们目前知道到哪一步的诚实描述。
机制 · 为什么细胞实验里惊艳的东西, 到人身上就平了
细胞实验的结果和人体试验的结果之间那道落差，其实是可以预料的。原因不神秘，就藏在实验装置里。培养皿里的浓度，你的血达不到。 研究者往培养液里加的是纯化过的分子，浓度由他自己定。而你吃一份浆果之后血里那点浓度，是被前面几道关一路砍剩下的。这两个数字常常差得很远。用血里达不到的浓度做出来的效果，本来就不该被当成吃了会怎样的预测。
培养皿里的分子，你的血里也没有。 加进培养液的是原样的分子。而你血里循环的，是被肠壁和肝脏挂过水溶性标签之后的版本，还有一部分是肠道细菌拆出来的碎片。形状变了，跟蛋白结合的方式就变了。等于说，实验测的那个分子，和到达你细胞的那个分子，是两个东西。
培养皿的上游没有肝脏。 细胞泡在液体里，分子直接碰到它。真实的顺序是：肠道吸收，经门静脉先进肝脏，肝脏处理一遍，剩下的才进入体循环。这一遍处理正是很多分子在体内看起来没效的原因——它压根没能以原样走到那里。
动物实验还有一层。 看到小鼠数据时值得多问一句：那个剂量按体重折回人身上，正常吃东西够得着吗？很多惊人效果成立的前提，是一个人一天吃不完的量。
把这四条合起来，你就有了一个不用读原文也能用的判断顺序：先看是体外、动物还是人；如果是体外，问浓度和形态；如果是动物，问剂量折算；如果是人，再问是观察还是随机、测的是中间指标还是真实终点。这套顺序对超级食物有用，对补剂、护肤品、功能饮料同样有用。
Chapter 5
Grain of truth · the foods themselves are fine
Grain of truth · the foods themselves are fine
To be fair: most foods labeled 'superfood' are genuinely nutritionally dense. Blueberry is rich in anthocyanins, and there is some human trial basis for vascular endothelial benefit; dark berries overall are low-sugar, high-fiber, high-antioxidant-polyphenol foods. Goji contains zeaxanthin, with observational evidence suggesting possible macular protection. Chia seeds are a plant source of omega-3 (as ALA) and dietary fiber.
The problem is not with the foods themselves, but with three things:
First, 'super' implies a magic effect from a single food, which contradicts the basic understanding of nutritional science — no single food determines health outcomes on its own.
Second, the premium is disproportionate. The price of a bag of imported açaí powder could buy a week of fresh blueberries, spinach, and oranges. The conversion between nutritional density and price is completely unbalanced.
Third, attention gets misdirected. Spending great mental energy on 'should I buy this superfood' distracts from what actually matters: whether the overall diet is built on whole foods, whether fruit and vegetable intake is adequate, and whether ultra-processed-foods make up too large a share.
The problem is not with the foods themselves, but with three things:
First, 'super' implies a magic effect from a single food, which contradicts the basic understanding of nutritional science — no single food determines health outcomes on its own.
Second, the premium is disproportionate. The price of a bag of imported açaí powder could buy a week of fresh blueberries, spinach, and oranges. The conversion between nutritional density and price is completely unbalanced.
Third, attention gets misdirected. Spending great mental energy on 'should I buy this superfood' distracts from what actually matters: whether the overall diet is built on whole foods, whether fruit and vegetable intake is adequate, and whether ultra-processed-foods make up too large a share.
清单 · 摘掉营销词之后, 真正剩下的是什么
把营销词摘掉，这几样食物身上还剩下什么？值得逐个说清楚，因为剩下的那部分是真的。蓝莓和深色浆果。 让它们发紫的花青素，是这批候选里人体数据最多的一类，在血管功能这类中间指标上有一定人体试验基础。同时它们本身就是低糖、高纤维的水果，这一条不依赖任何超级叙事。
枸杞。 含玉米黄素 (zeaxanthin)，观察性研究提示它可能与眼睛黄斑的保护有关。请注意这里的措辞：观察性、提示、可能，这正是它目前所在的证据位置。
奇亚籽。 是 omega-3 (ALA 形式) 和膳食纤维的植物来源。
这三条有一个共同点：它们描述的都是这个食物里有这类分子，也就是前面说的第一个数，含量。从这里到它在你身上做了什么，中间还要走完吸收、代谢、到达那几道关。所以它们值得进你的购物车，理由是它们是不错的完整食物，而不是它们是超级食物。
机制 · 那点真实的好处, 可能是怎么发生的
如果吸收率真的那么低，那在人身上确实观察到的那一点好处，又是怎么发生的？目前最站得住的解释，是前面提过的信号思路，而不是清洁思路。少量分子，以及肠道细菌把它拆出来的那些碎片，进入血液之后可能停在血管内壁细胞上的某个位置，改变这些细胞接下来的行为。在这条思路里，起作用的不是总量，而是碰到了哪个开关。这也正好解释了为什么吸收率低到这个程度，还能观察到一点效果。
同样重要的是这条思路目前的强度：它是说得通，不是已证实。人体终点证据仍然稀少，证据等级停在 C 级。把它当成一个正在被检验的假说，比当成一条结论要准确得多。
顺着这条思路还有一件常被忽略的事：整颗浆果里同时还有纤维、水分，以及一整套别的植物分子。你吃下去的从来不是花青素，而是一颗蓝莓。用一个提纯出来的成分去代表整颗水果，正是超级食物营销最常走的那一步，而这一步在机制上并没有依据支持。
Chapter 6
What to actually do · variety beats any single star
What to actually do · variety beats any single star
If 'superfood' is a marketing construct, what dietary advice actually has evidence behind it?
Core principle: dietary variety. Large bodies of evidence support the overall health benefits of eating a wide variety of colorful vegetables and fruits — far more than focused supplementation with any single food. Well-evidenced dietary patterns such as the Mediterranean diet and DASH diet share a common character: not 'eat a specific superfood', but 'diverse vegetables and fruit, mostly whole grains, moderate animal protein, fewer ultra-processed foods'.
For blueberries and dark berries with some evidence basis: if you enjoy them and the price is acceptable, they are absolutely worth eating. But there is no need to force yourself to consume expensive imported superfood products. Local, seasonal, varied produce will deliver no worse results at a far lower price.
Practical decisions:
Replace imported superfood berry powders with the cheapest seasonal berries in your areaRedirect the superfood budget to increasing overall vegetable intakeFocus on overall dietary structure rather than the 'function' of any single foodTreat any 'exclusive ingredient', 'highest antioxidant', or 'clinically proven' claims with scrutiny
This content is for health education only and does not substitute for personalized advice from a doctor or registered dietitian.
Core principle: dietary variety. Large bodies of evidence support the overall health benefits of eating a wide variety of colorful vegetables and fruits — far more than focused supplementation with any single food. Well-evidenced dietary patterns such as the Mediterranean diet and DASH diet share a common character: not 'eat a specific superfood', but 'diverse vegetables and fruit, mostly whole grains, moderate animal protein, fewer ultra-processed foods'.
For blueberries and dark berries with some evidence basis: if you enjoy them and the price is acceptable, they are absolutely worth eating. But there is no need to force yourself to consume expensive imported superfood products. Local, seasonal, varied produce will deliver no worse results at a far lower price.
Practical decisions:
Replace imported superfood berry powders with the cheapest seasonal berries in your areaRedirect the superfood budget to increasing overall vegetable intakeFocus on overall dietary structure rather than the 'function' of any single foodTreat any 'exclusive ingredient', 'highest antioxidant', or 'clinically proven' claims with scrutiny
This content is for health education only and does not substitute for personalized advice from a doctor or registered dietitian.
机制 · 多样性不是和稀泥, 它有具体理由
多吃几种颜色听上去像一句和稀泥的建议，其实它是从前面那条链里推出来的，理由很具体。理由一，不同颜色是不同的分子。 植物造这些色素不是为了给人补充营养，是为了自己活下去：挡紫外线、封住伤口、把味道弄苦好赶走啃它的东西。不同科属的植物面对的敌人不同，造出来的分子也就不同。深色浆果里的花青素、胡萝卜和南瓜里的类胡萝卜素、十字花科里的含硫化合物，结构互不相同，在体内的去向也不同，彼此顶替不了。多吃一种颜色，拿到的是一类新分子，而不是同一样东西的更多份。
理由二，吸收路径本来就是分开的。 脂溶性的那一类，比如类胡萝卜素，要搭着这一餐的脂肪一起被吸收，所以配点油会不一样；水溶性的那一类走的是另一条路。把赌注全押在一种食物上，等于只用了其中一条路。
理由三，吸收率低这件事反过来支持多样。 既然任何单一多酚的吸收率都很低，那么在同一样东西上加量这条路的天花板很矮，加倍吃并不能把血里的量等比例抬起来。相比之下，换一种颜色是在打开一条新通道，而不是在同一条已经拥堵的通道上继续加压。
理由四，整体结构才是主要变量。 你一天里吃进去多少纤维、多少蔬果、多少超加工食品，这几个量级远大于有没有加那一勺粉。把预算和注意力放在能拨动主要变量的地方，收益差别不是一点点。
所以多样性不是因为我们不知道哪个最好才给出的模糊建议。它是在知道了每一种的吸收都很有限、作用也各不相同之后，唯一说得通的策略。
工具 · 下次看到一个新的超级食物, 按顺序问这五句
这一岛真正想留给你的，不是哪些食物是骗人的这张名单，名单每隔几年就换一批。留给你的是一套自己能用的提问顺序。第一句：这个数字是在哪儿量的？ 试管、培养皿、动物，还是人？如果是试管或培养皿，它量的是化学反应速度，不是身体里的效果，到这里就可以先降一档权重。
第二句：它按什么单位比的？ 每克，还是一次实际吃的份量？干粉和新鲜食物按每克比，水已经先被拿掉了，那个倍数里有一部分只是脱水。
第三句：它进得去吗？ 多酚这一类分子普遍个头大、亲水，肠壁对它们很不友好，绝大部分不会被吸收。任何跳过这一步直接谈效果的宣称，都缺了最关键的一环。
第四句：到达的还是原来那个分子吗？ 被吸收进来的会立刻被挂上水溶性标签，没被吸收的会被肠道细菌拆开。血里循环的，通常不是包装上印的那个名字。
第五句：测的是中间指标还是真实结局？ 血管弹性或者某个血液标志物变好，和几年后少得一次病，是两码事。营销通常只讲前者，并把它说成后者。
五句问完，绝大多数超级食物宣称会停在第一句或者第三句。而真正经得起问的那几条结论，多吃蔬果、种类要杂、少吃超加工，恰好一条都不需要超级这个词。
References · 8
- European Commission. (2012). Commission Regulation (EU) No 432/2012 establishing a list of permitted health claims made on foods. Health claims require authorization based on EFSA scientific assessment. eur-lex.europa.eu/eli/reg/2012/432/oj
- European Parliament and Council. (2006). Regulation (EC) No 1924/2006 on nutrition and health claims made on foods. Restricts unsubstantiated health claims, the basis on which generic 'superfood' marketing became non-compliant in the EU. eur-lex.europa.eu/eli/reg/2006/1924/oj
- U.S. Department of Agriculture, Agricultural Research Service. (2012). Withdrawal of the USDA ORAC (Oxygen Radical Absorbance Capacity) database for selected foods. ARS stated ORAC values are biologically misleading because in-vitro antioxidant capacity does not predict in-vivo health effects. www.ars.usda.gov
- Prior, R. L., Wu, X., & Schaich, K. (2005). Standardized methods for the determination of antioxidant capacity and phenolics in foods and dietary supplements. Journal of Agricultural and Food Chemistry, 53(10), 4290-4302. Describes the ORAC assay and its in-vitro limitations. 10.1021/jf0502698
- Cassidy, A., Mukamal, K. J., Liu, L., Franz, M., Eliassen, A. H., & Rimm, E. B. (2013). High anthocyanin intake is associated with a reduced risk of myocardial infarction in young and middle-aged women. Circulation, 127(2), 188-196. Observational; ~93,600 women over 18 years. 10.1161/CIRCULATIONAHA.112.122408
- Devore, E. E., Kang, J. H., Breteler, M. M. B., & Grodstein, F. (2012). Dietary intakes of berries and flavonoids in relation to cognitive decline. Annals of Neurology, 72(1), 135-143. Observational; higher berry intake tracked with slower cognitive decline. 10.1002/ana.23594
- Kalt, W., Cassidy, A., Howard, L. R., Krikorian, R., Stull, A. J., Tremblay, F., & Zamora-Ros, R. (2020). Recent research on the health benefits of blueberries and their anthocyanins. Advances in Nutrition, 11(2), 224-236. Anthocyanins are poorly absorbed and act more as signaling molecules; human disease-outcome evidence is modest. 10.1093/advances/nmz065
- U.S. Department of Agriculture & U.S. Department of Health and Human Services. (2020). Dietary Guidelines for Americans, 2020-2025 (9th ed.). www.dietaryguidelines.gov/sites/default/files/2020-12/Dietary_Guidelines_for_Americans_2020-2025.pdf