Diet and Acne: Finding Your Actual Trigger

klinikdrtanyz

Sep 4

9 min read

Updated: Sep 29

中文摘要在文末

I'll start with my own skin, because it makes the point better than anything else I could say.

When I had acne breakouts as a younger man, I was certain I knew what was causing them.

I blamed my water intake. I blamed chocolate. I blamed coffee. I blamed fried chicken. I blamed spicy food. At one point I was fairly sure it was my towel.

I was wrong about all of it.

Once my skin was properly under control, I went back and reintroduced nearly everything on that list, one at a time, and watched what happened. Chocolate: nothing. Coffee: nothing. Fried chicken: nothing. Spicy food: nothing. The towel, obviously: nothing.

The actual trigger was groundnuts.

Not a food I'd ever suspected. And there's a second detail that matters just as much: it wasn't groundnuts at any quantity. It's more than a small bowl. Below that, my skin is fine. Above it, I get a small breakout.

So I spent years avoiding things that were doing nothing, while eating the one thing that was — and I only found out because I did it properly.

That's what this article is about.

Why acne is different from eczema here

I take a different position on diet in acne than I do in eczema, and it's worth explaining why.

With eczema, my line is: treat first, diet second. If your skin barrier is broken and inflamed, no amount of dietary purity fixes it, and I've watched patients spend months on elimination diets with terrible skin the whole time.

With acne, diet gets enforced from day one.

The dietary contribution to acne is more direct and more reliable than in eczema, so it's part of the plan from the start rather than a later refinement.

But — and this is the important part — enforced doesn't mean eliminated.

Day one: cut it by half, not to zero

My instruction at the start of treatment is deliberately moderate:

Reduce the relevant foods by about 50%. Not 100%.

There are two reasons, and both matter.

The practical one: total restriction fails. People manage it for two or three weeks, then a family gathering happens, and the whole thing collapses along with their confidence. A 50% reduction is something you can actually sustain for three months, and a sustained 50% beats an abandoned 100% every time.

The diagnostic one, which is less obvious: if you cut everything to zero on day one, you've

destroyed your ability to find out what your actual trigger is. You'll clear up — possibly from the treatment, possibly from a food, and you'll have no way to distinguish them. Then you're avoiding a long list of foods forever, most of which were innocent, without ever knowing which one mattered.

That's exactly the trap I was in with my chocolate and my coffee and my towel.

Then, in the Fade phase: test properly

Here's where it gets useful.

By the Fade phase — roughly three months in — your acne is under control. The breakouts have stopped. And that's precisely what makes food testing possible, because now you have a stable baseline to test against.

You couldn't do this earlier. When acne is actively breaking out, you can't tell whether a lesion came from something you ate or from the underlying process doing what it was already doing. The noise drowns the signal.

Once it's quiet, the signal is readable.

So we reintroduce foods, one at a time, and watch. And several things become findable that weren't before:

Which food is actually your trigger — often not what you assumed.

Whether you have one at all. Plenty of people don't, and finding that out is genuinely liberating after years of suspicion.

And how much of it you can have. This is the part people never get to, and it's often the most useful. It's rarely "this food causes acne." It's usually "this food, above a certain amount, causes acne." In my case, more than a small bowl of groundnuts. Below that threshold, nothing.

Knowing your threshold is completely different from knowing your trigger. One means never eating something again. The other means eating it sensibly.

How to test it properly

One food at a time. Reintroduce a single thing and hold everything else steady. Test two together and you've learned nothing.

Give it long enough. A lesion doesn't appear the same evening. Allow a reasonable window before concluding a food is clear — a few days at minimum.

Then test the amount. If something does trigger you, don't stop at "avoid it." Work out roughly where your threshold sits. That's the difference between a rule you'll follow and a rule you'll break resentfully.

Write it down. Not an obsessive food diary — just enough to see the pattern rather than reconstructing it from memory three weeks later.

Do it during Fade, not during Clear. If you test during the Clear phase, you're testing against a moving background and you'll get a false answer.

What about the usual suspects?

People ask about specific foods, so briefly.

Dairy and high-glycaemic foods — sugar, refined carbohydrates — are the ones with the most substantial support behind them as contributors. Those are generally the ones I'd have you reduce by half at the start.

Chocolate, spicy food, fried food get blamed constantly and are much less reliably implicated. They may matter for you. They may not. That's what the testing is for.

Water intake doesn't do what people think it does for acne.

And I'd note that "the ones with the most support" is a statement about populations, not about you. You are a sample of one, which is exactly why the individual testing is worth doing rather than following a general list forever.

What I'd steer you away from

Months of severe restriction while the acne is untreated. This is the version that does actual harm — nutritionally, socially, and psychologically. If someone's cut out dairy, sugar, chocolate, fried food, spicy food and half of what they enjoy, and their skin is still bad, the problem was never the food.

Concluding a food is guilty from a single coincidence. You ate something, you broke out three days later, so now it's banned for life. Acne lesions have a several-day formation timeline and appear for many reasons. One coincidence isn't evidence.

Anxiety about food. I said this about eczema and it applies here too: the stress of policing everything you eat can do more damage than most of the foods would. And in adult acne particularly, where stress is often driving the whole picture, an anxious relationship with food is working directly against you.

The order, one more time

Clear phase: control the acne, reduce the likely suspects by about half, don't try to identify triggers yet.

Fade phase: acne is quiet, marks are being addressed — now reintroduce foods one at a time and find your actual trigger and your threshold.

Maintain: you know what your food is, and how much of it you can have. That's a rule you can live with permanently, which is the whole point.

And if the answer is "no trigger"

That happens, and it's a good outcome rather than a disappointing one.

Some people's acne is simply not meaningfully food-driven. Finding that out means you can stop scrutinising every meal, which removes a source of stress — and given how much stress contributes to acne, particularly adult acne, that's not a small benefit.

You'd never find that out by eliminating everything and never testing. You'd just avoid a long list forever, exactly as I did with chocolate, coffee, fried chicken, spicy food, and one entirely innocent towel.

Klinik Dr Tan (Skin & Acne), Lot 27, Ground Floor, Block D, Lintas Square, Kota Kinabalu. WhatsApp 017-234 7328. Appointments preferred.

Book a consultation with Dr. Tan — Book Online or WhatsApp 017-234 7328.

Read more about our acne treatment programme : Adult Acne, 5 Acne Mistakes, /skinandacne

简要说明

我是陈医生，亚庇 Lintas Square 的 Klinik Dr Tan（皮肤与暗疮）。

先从我自己的皮肤说起，因为这比什么都更能说明重点。

年轻的时候长痘，我很确定自己知道原因。我怪喝水不够、怪巧克力、怪咖啡、怪炸鸡、怪辣的东西。有一阵子我相当确定是我的毛巾。

这些我全都猜错了。

等我的皮肤真正受控之后，我回头把那份清单上的东西几乎全部一样一样加回来，观察结果。巧克力：没事。咖啡：没事。炸鸡：没事。辣的：没事。毛巾，当然：没事。

真正的诱因是花生。

一个我从来没怀疑过的东西。而且还有第二个同样重要的细节：不是任何份量的花生都会——是超过一小碗。低于那个量，我的皮肤没事；超过，就会冒一点小痘。

所以我花了好几年在避开完全没作用的东西，同时吃着那个真正有作用的——而我之所以会知道，是因为我用对了方法。

为什么痘痘和湿疹在这件事上不同

湿疹我的立场是：先治疗，饮食其次。 但痘痘的饮食是从第一天就要执行的，因为饮食在痘痘上的作用比在湿疹上更直接、更可靠。

但——这是重点——「执行」不等于「戒断」。

第一天：减一半，不是归零

我在治疗一开始的指示是刻意温和的：把相关食物减少约 50%，而不是 100%。

实务上的理由：完全禁止会失败。撑两三个星期，一场家庭聚会，整件事连同信心一起崩掉。减半是你真的可以维持三个月的，而「维持住的 50%」永远胜过「放弃掉的 100%」

。

诊断上的理由（比较不明显）：如果你第一天就把所有东西归零，你等于摧毁了「找出真正诱因」的能力。你会好起来——可能因为治疗，也可能因为某种食物，而你无从分辨。然后你会永远避开一长串食物，其中多数是无辜的，而且你永远不知道哪一个才算数。

那正是我当年的处境——我的巧克力、我的咖啡、我的毛巾。

然后在淡化期：好好测试

到了淡化期（大约三个月），你的痘痘已经受控，爆发停止了。而这正是让食物测试变得可行的原因，因为你现在有了一个稳定的基线可以拿来比较。

更早是做不到的。 痘痘还在活跃地长的时候，你分不出一颗痘是来自你吃的东西，还是来自那个本来就在进行的过程。杂讯盖过讯号。

一旦安静下来，讯号就读得出来了。

这时候可以找出：你真正的诱因是什么（往往不是你以为的那个）；你到底有没有诱因（很多人没有，而在怀疑了多年之后知道这件事是真正的解脱）；以及你可以吃多少。

最后这一点大家从来没走到，而它往往最有用。 很少是「这个食物会长痘」，通常是**「这个食物超过某个量会长痘」**。以我为例：超过一小碗花生。低于那个量，什么事也没有。

知道你的「阈值」和知道你的「诱因」是完全不同的两件事。一个意味着从此不能再吃，另一个意味着可以正常地吃。

怎么测才对：一次只加回一种（同时测两种等于什么都没学到）；给足够的时间（痘不会当天晚上就冒，至少几天）；接着测份量（如果确实会诱发，不要停在「避开它」，找出你的阈值大概在哪里——那是「你会遵守的规则」和「你会不甘愿地违反的规则」之间的差别）；记下来（不是强迫式的饮食日记，只要足够看出模式）；在淡化期做，不要在清除期做（在清除期测，你是在一个移动的背景上测，会得到假的答案）

。

关于那些「常见嫌疑犯」：乳制品和高升糖食物（糖、精制碳水）是证据支持相对较强的，通常就是我会请你一开始减半的那些。巧克力、辣的、油炸的经常被怪罪，但证据可靠度低很多——可能对你有影响，也可能没有，这正是测试的用途。 喝水对痘痘的作用不是大家想的那样。

而且要注意：「证据支持较强」是关于族群的陈述，不是关于你的。你是样本数为一的个体，这正是值得做个人化测试、而不是永远照着一份通用清单生活的原因。

我会劝你避免的：在痘痘没有被治疗的情况下进行数月的严格戒口（这个版本会造成实际伤害——营养上、社交上、心理上。如果一个人戒掉了乳制品、糖、巧克力、油炸、辣的和一半他喜欢的东西，皮肤还是很糟，那问题从来就不在食物）；因为一次巧合就判某个食物有罪（痘痘的形成有好几天的时间线，而且原因很多，一次巧合不是证据）；对食物的焦虑（监控自己吃的每一样东西所带来的压力，可能比多数食物本身更伤——而在成人痘尤其如此，因为压力往往正在驱动整个局面）。

顺序，再说一次：清除期——控制痘痘、把可能的嫌疑犯减半、先不要试图找诱因。淡化期——痘痘安静了、正在处理痘印，这时一次一种加回食物，找出真正的诱因和你的阈值。维持期——你知道是哪个食物、以及能吃多少。那是一个你可以长期共存的规则，而这正是整件事的目的。