Eating Tomato Paste for 3 Months Changes the Brain — 5ch: “So Ketchup Is the Ultimate Condiment”

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The story

A new study reports that a group who ate tomato paste every day for three months showed changes in both cognitive test scores and fMRI brain scans. Antioxidants found in tomatoes, such as lycopene, are thought to be involved. On 5ch, some praised the popularity of high-lycopene drinks and their fit with the Mediterranean diet, while others raised doubts about the study’s design — including the small number of participants and whether there was a proper control group — leaving opinions on the effect divided.

Study finds that eating tomato paste continuously for three months produces changes in cognitive function and brain scan images

Tomatoes are a popular food eaten worldwide, rich in nutrients including lycopene, the compound behind their red color.

A new study has reported that eating tomato paste continuously for three months leads to changes in cognitive function and brain scan images.

Source: mdpi.com / Original article here

What people said

2AnonymousSep 10, 2026 23:48
Which way will this go?
3AnonymousSep 11, 2026 00:17
Kagome, Heinz, Del Monte: "So there you have it."
4AnonymousSep 11, 2026 01:40
Red yeast rice supplements: "If a specific product turns out contaminated, the effects can be fatal" (a nod to Japan's 2024 beni-koji supplement scandal)
5AnonymousSep 11, 2026 04:25
I'd get sick of eating it every single day
6AnonymousSep 11, 2026 08:06
Pair low-salt Japanese food with Mediterranean-style tomatoes and seafood and you'd have the ultimate diet
7AnonymousSep 11, 2026 08:31
I actually had a stroke once because my blood was too sludgy. So I asked my doctor, 'If I load up on lycopene, will my blood thin out and I'll get healthy?' He just flat-out laughed and said, 'Ha ha, no way — if it were that easy, nobody would need doctors.'
21AnonymousSep 11, 2026 11:57
Re: #7
The doctor was laughing at the simplistic idea of 'just eat this and you're fine.' A healthy diet should really be thought of as just a preventive habit.
26AnonymousSep 11, 2026 12:21
Re: #7
…'load up on it'!? Wait, do you still have aftereffects from the stroke…?
8AnonymousSep 11, 2026 08:47
Tomatoes are so expensive though
9AnonymousSep 11, 2026 08:52
Some regular folks have already caught on to this. The 200ml carton of high-lycopene tomato juice is always sold out — because it's priced the same as regular tomato juice, so the smart shoppers grab the high-lycopene one.
20AnonymousSep 11, 2026 11:45
Re: #9
Guess lycopene just has more marketing pull than other health claims? Though lately a lot of tomato juices are pushing GABA instead.

What bugs me is this paper doesn't touch on cholesterol at all — that's usually the first thing you'd expect them to mention. Makes me wonder if the results there just weren't great. A lot of other papers show pretty lukewarm effects on that front too.
10AnonymousSep 11, 2026 08:56
So is tomato stuff actually good for the brain or not?
11AnonymousSep 11, 2026 08:57
Re: #10
Even if it's a struggle on the wallet, it's worth it if it makes something you're not that fond of easier to get down.
12AnonymousSep 11, 2026 08:58
Lycopene's a hydrocarbon, so it's fat-soluble. Wouldn't that just turn your body fat red?
14AnonymousSep 11, 2026 09:04
If lycopene's so great, does that mean I got smarter over the summer from eating a ton of watermelon?
15AnonymousSep 11, 2026 09:14
Cells are made of fat, and without antioxidants they just keep deteriorating.

A diet like the Mediterranean one, which supplies good-quality oils and antioxidants, is genuinely great — it's effective against stroke too.

But you can't eat nothing but tomatoes and olive oil year-round, so the real question becomes how you keep getting non-hexane-extracted oils and antioxidants into your diet.

Honestly, just using good-quality oil and good-quality salt in traditional Japanese cooking already makes it pretty healthy. Add something that gives you polyphenols as an occasional treat, and your diet has nothing to worry about.

If you don't build health up from the cellular level as a foundation, patching things up with medication later just leads to polypharmacy problems.
17AnonymousSep 11, 2026 10:21
Re: #15
Japanese people should strictly avoid overdoing it on fat, no matter what kind.
16AnonymousSep 11, 2026 09:18
Not quite a predatory journal, but definitely second-tier.
A sample of just 42 people is way too small.
No placebo group or dietary controls, so other factors aren't ruled out.
The cognitive tests did show a significant difference, but it's nowhere near dramatic rejuvenation or an IQ boost.

They're using blood tests and fMRI to probe cognition, but that alone can't confirm the effect.
And the source is GIGAZINE (lol) — classic clickbait headline.
18AnonymousSep 11, 2026 11:24
Does ketchup count too?
22AnonymousSep 11, 2026 12:02
By that logic, Spaniards' and Italians' brains should be significantly different from other countries' — but I've never heard of anything like that.
23AnonymousSep 11, 2026 12:05
As plants go, tomatoes are especially high in glutamic acid
24AnonymousSep 11, 2026 12:06
Re: #20
I think if you do a straight taste test, the high-lycopene one just tastes better, so people keep buying it again.
27AnonymousSep 11, 2026 12:32
Eat tomato-stewed oily fish like sardines, saury, and mackerel every day, and you get DHA/EPA on top of the lycopene — even better for your brain.
28AnonymousSep 11, 2026 12:33
Re: #1
Just post the whole thing, that'll make it clear!! Post it pretending to be someone else.
29AnonymousSep 11, 2026 12:47
So that means ketchup is the ultimate condiment, huh
30AnonymousSep 11, 2026 13:09
So if you get taurine and tomatoes, that turns you into a baby, huh
31AnonymousSep 11, 2026 13:14
Re: #30
You eat it right now! Eat a whole heap of it! It works wonders on the brain!
32AnonymousSep 11, 2026 14:28
I mean, if you actually like tomato juice or unsweetened vegetable juice, you can just drink it for the price or the taste — that's fine. But the people buying the little bottles touting GABA or lycopene, choosing it for that reason rather than the taste, are probably people who don't actually like tomatoes to begin with. They're basically drinking it like medicine out of obligation, which is kind of sad in a way.
33AnonymousSep 11, 2026 14:53
It's pointless. Your mortality rate is 100%.
34AnonymousSep 11, 2026 14:58
Is that the toxin they say will kill you if you eat a whole drum's worth of it every day?
40AnonymousSep 11, 2026 18:09
The English spelling is 'lycopene,' and since Japan generally uses Latin-style readings for such terms, it should technically be called 'rikopen' — not 'rikopin.'

Background and Key Points of Debate

The underlying paper was published in a journal put out by MDPI, a major open-access publisher also known for divided opinions on the rigor of its peer review. The main point of contention in the thread was the scale of the study — many raised doubts about the small number of participants and whether control conditions, such as a placebo group or dietary restrictions, were clearly specified. At the same time, some posts noted that many tomato juice buyers actively seek out high-lycopene products, pointing to real consumer interest in the topic. Commenters also noted that a news headline alone can’t tell you whether a “change” is good or bad — a reminder that topics like this can spread widely on the strength of a headline alone, without anyone checking the primary source, the paper itself.

*This article is excerpted and summarized from the 5ch (Science News+) thread “[Health] Study Finds Changes in Cognitive Function and Brain Scans After Eating Tomato Paste Daily for Three Months.”

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